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Momentum, Energy, Power and Machines

Total questions: 160

Worksheet time: 3hrs 17mins

Name
Class
Date
1.
What is the formula for mechanical advantage?
a)
MA = Resistance Force / Effort Force
b)
MA = Length of Effort Arm / Length of Resistance Arm
c)
MA = Work Input / Work Output
d)
All of the above
2.
After a collision, an object moves at 6 m/s at an angle of 45°. If its mass is 4 kg, what are the x and y components of its momentum?
a)
12 kg·m/s
b)
24 kg·m/s
c)
18 kg·m/s
d)
30 kg·m/s
3.
What is the angular displacement of a fan blade that rotates at 6 degrees per second for 4 seconds?
a)
24 degrees
b)
30 degrees
c)
36 degrees
d)
40 degrees
4.
An objects momentum can be calculated by multiplying the velocity of the object by its_____.
a)
time
b)
mass
c)
acceleration
d)
length
5.
Which has a greater momentum a semi-truck at rest or a bicycle in motion?
a)
truck
b)
bicycle
c)
neither has momentum
d)
same
6.
Applying a force for a longer time increases the change in _________.
a)
mass
b)
gravity
c)
momentum
d)
time
7.
_______ is a change in momentum.
a)
Impulse
b)
Gravity
c)
Mass
d)
Distance
8.
When a golf club hits a golf ball, the change in momentum of the club is_______the change in momentum of the ball.
a)
less than
b)
greater than
c)
equal to
d)
none of the answers
9.
The momentum of a 225 g softball moving at 35 m/s is
a)
7.9 kg m/s
b)
3.5 N
c)
5.0 m/s
d)
2.1 kg m/s
10.
An 81 kg football player moving 6.5 m/s tackles and collides with a stationary 140 kg football player. What speed will the football players have the moment after impact?
a)
0 m/s
b)
4.8 m/s
c)
2.4 m/s
d)
3.8 m/s
11.
A 740 kg car traveling 19 m/s comes to a complete stop in 2.0 s. What is the force exerted on the car during this stop?
a)
85 N
b)
850 N
c)
7000 N
d)
9200 N
12.
The law of of____________ of momentum states that momentum is neither created nor destroyed.
a)
gravitation
b)
conservation
c)
preservation
d)
reservation
13.
The symbol for momentum in physics is the letter ___.
a)
m
b)
p
c)
l
d)
s
14.

A 758-kg object is moving in a straight line at 69.2 m/s when it collides with a second object, which is moving in the same direction at 60.9 m/s when it is struck from behind. If the mass of the second object is 711 kg and its final velocity after the elastic collision is 69.5 m/s, what is the final velocity of the first object?

(a)  

15.

An object is moving in a straight line at 6.39 m/s when it collides elastically with a second object, which has a mass of 56.4 kg and is moving in the opposite direction at 6.35 m/s. If the first object's final velocity is -8.69 m/s and the second object's final velocity is 4.05 m/s, what is the mass of the first object?

(a)  

16.

An object is moving in a straight line at 74.2 m/s when it collides with a second object, which has a mass of 599 kg and is moving in the opposite direction at 75.9 m/s. As a result of the inelastic collision, their final velocity is 6.70 m/s. What is the mass of the first object?

(a)  

17.
If a wheel spins at 15 degrees per second for 3 seconds, what is the total angular displacement?
a)
30 degrees
b)
45 degrees
c)
60 degrees
d)
75 degrees
18.
A motor shaft rotates at 12 degrees per second for 2 seconds. What is the angular displacement?
a)
12 degrees
b)
24 degrees
c)
36 degrees
d)
48 degrees
19.
A bicycle wheel has a radius of 0.5 meters and moves at a linear speed of 10 m/s. What is its angular velocity?
a)
20 rad/s
b)
25 rad/s
c)
30 rad/s
d)
35 rad/s
20.
If a fan blade has a linear speed of 8 m/s and a radius of 0.2 meters, what is its angular velocity?
a)
40 rad/s
b)
50 rad/s
c)
60 rad/s
d)
70 rad/s
21.
A conveyor belt moves at a speed of 15 m/s. If the radius of the pulley is 0.6 meters, what is the angular velocity of the pulley?
a)
25 rad/s
b)
30 rad/s
c)
35 rad/s
d)
40 rad/s
22.
A motorcycle accelerates at 4 m/s². What is the angular acceleration of its wheels with a radius of 0.25 meters?
a)
16 rad/s²
b)
12 rad/s²
c)
10 rad/s²
d)
8 rad/s²
23.
A skateboard accelerates at 3 m/s². Find the angular acceleration of a wheel with a radius of 0.15 meters.
a)
20 rad/s²
b)
15 rad/s²
c)
10 rad/s²
d)
5 rad/s²
24.
A truck accelerates at 2 m/s². What is the angular acceleration of its tires if they have a radius of 0.8 meters?
a)
2.5 rad/s²
b)
2.0 rad/s²
c)
1.5 rad/s²
d)
1.0 rad/s²
25.
What is the moment of inertia of a solid disk with a mass of 5 kg and a radius of 0.5 meters?
a)
0.625 kg·m²
b)
1.25 kg·m²
c)
1.5 kg·m²
d)
2.5 kg·m²
26.
Calculate the moment of inertia of a point mass of 4 kg located 0.3 meters from the axis of rotation.
a)
0.36 kg·m²
b)
0.12 kg·m²
c)
0.09 kg·m²
d)
0.48 kg·m²
27.
Determine the moment of inertia of a rod with a mass of 6 kg and a length of 2 meters about an axis through its center.
a)
1 kg·m²
b)
2 kg·m²
c)
3 kg·m²
d)
4 kg·m²
28.
A rotating object has a moment of inertia of 2 kg·m² and an angular acceleration of 5 degrees/s². What is the torque?
a)
10 N·m
b)
8 N·m
c)
6 N·m
d)
4 N·m
29.
If a disc with a moment of inertia of 1.5 kg·m² experiences an angular acceleration of 3 degrees/s², calculate the torque.
a)
4.5 N·m
b)
5.5 N·m
c)
6.5 N·m
d)
7.5 N·m
30.
A wheel has a moment of inertia of 4 kg·m² and experiences an angular acceleration of 2 degrees/s². What is the torque applied to it?
a)
6 N·m
b)
8 N·m
c)
10 N·m
d)
12 N·m
31.
A disc has a moment of inertia of 2 kg·m² and is rotating at an angular velocity of 15 degrees/s. What is its angular momentum?
a)
30 kg·m²/s
b)
25 kg·m²/s
c)
20 kg·m²/s
d)
15 kg·m²/s
32.
If a wheel with a moment of inertia of 5 kg·m² spins at 8 degrees/s, calculate its angular momentum.
a)
40 kg·m²/s
b)
35 kg·m²/s
c)
30 kg·m²/s
d)
25 kg·m²/s
33.
A rotating cylinder has a moment of inertia of 4 kg·m² and an angular velocity of 12 degrees/s. What is its angular momentum?
a)
48 kg·m²/s
b)
50 kg·m²/s
c)
52 kg·m²/s
d)
54 kg·m²/s
34.
A disk with a moment of inertia of 4 kg·m² is spinning with an angular velocity of 20 degrees/s. What is its initial angular momentum?
a)
80 kg·m²/s
b)
60 kg·m²/s
c)
40 kg·m²/s
d)
20 kg·m²/s
35.
What is the angular acceleration caused by a torque of 8 N·m applied to a disk with a moment of inertia of 4 kg·m²?
a)
2 rad/s²
b)
4 rad/s²
c)
6 rad/s²
d)
8 rad/s²
36.
A car travels 100 m against a constant friction force of 200 N. What is the work done against friction?
a)
2000 J
b)
1000 J
c)
500 J
d)
400 J
37.
A 1 kg ball moving at 5 m/s collides inelastically with a stationary 2 kg ball. What is the final velocity of the combined mass after the collision?
a)
1.67 m/s
b)
2.5 m/s
c)
3.33 m/s
d)
4 m/s
38.
In a perfectly elastic collision, a 0.5 kg cart moving at 2 m/s collides with a stationary 1 kg cart. What is the final velocity of the 1 kg cart?
a)
0 m/s
b)
1 m/s
c)
2 m/s
d)
3 m/s
39.
Two objects collide in a two-dimensional plane. Object A (2 kg) is moving at 2 m/s at an angle of 30° from the horizontal, and Object B (3 kg) is moving at 3 m/s at an angle of 150°. What is the total momentum of the system before the collision?
a)
6 kg·m/s
b)
8 kg·m/s
c)
10 kg·m/s
d)
12 kg·m/s
40.
After a collision, an object moves at 6 m/s at an angle of 45°. If its mass is 4 kg, what are the x and y components of its momentum?
a)
12 kg·m/s
b)
24 kg·m/s
c)
18 kg·m/s
d)
30 kg·m/s
41.
A projectile is launched at an angle of 60° with an initial speed of 10 m/s. What is its horizontal momentum component at the moment of launch?
a)
5 kg·m/s
b)
8.66 kg·m/s
c)
10 kg·m/s
d)
3 kg·m/s
42.
A rake has an input arm of 0.4 meters and an output arm of 1.0 meters. What is the mechanical advantage of the rake?
a)
0.4
b)
1.0
c)
2.5
d)
4.0
43.
A broom has an input arm of 0.4 meters and a mechanical advantage of 0.5. What is the length of the output arm?
a)
0.2 meters
b)
0.4 meters
c)
0.8 meters
d)
1.0 meters
44.
A child's toy rake has an output arm of 0.75 meters and a mechanical advantage of 0.33. What is the length of the input arm?
a)
0.25 meters
b)
0.75 meters
c)
2.25 meters
d)
3.0 meters
45.
A wheelbarrow has an input distance of 0.99 m and an output distance of 0.45 m. What is the mechanical advantage of the wheelbarrow?
a)
0.45
b)
0.99
c)
2.2
d)
3.0
46.
Amanda can lift 600 N of bricks with a wheelbarrow using only 120 N of force. What is the mechanical advantage of the wheelbarrow?
a)
2
b)
4
c)
5
d)
6
47.
Marshall uses a lever to lift a 400 N stump. He weighs 250 N. What is the mechanical advantage of the lever he is using?
a)
0.625
b)
1.6
c)
2.5
d)
4.0
48.
A machine requires 120 J of input energy to do 35 J of useful work. What is the efficiency of the machine?
a)
29.2%
b)
35.0%
c)
50.0%
d)
75.0%
49.
A cyclist expends 900 J of work to produce 76 J of useful work. What is the efficiency of the cyclist?
a)
8.4%
b)
13.3%
c)
27.5%
d)
71.1%
50.
A force of 50 N is applied to the end of a lever to lift a 350 N rock. What is the mechanical advantage of the lever?
a)
3.5
b)
7.0
c)
10.0
d)
14.0
51.
A lever has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?
a)
1.6
b)
2.5
c)
4.0
d)
5.0
52.
A lever has an input arm of 3 meters and an output arm of 2 meters. What is the mechanical advantage of the lever?
a)
0.67
b)
1.0
c)
1.5
d)
2.0
53.
A lever has an input arm of 2 meters and a mechanical advantage of 4. What is the length of the output arm?
a)
0.5 meters
b)
1.0 meters
c)
2.0 meters
d)
4.0 meters
54.
A lever has an output arm of 0.8 meters and a mechanical advantage of 6. What is the length of the input arm?
a)
0.13 meters
b)
0.8 meters
c)
2.4 meters
d)
4.8 meters
55.
Which formula relates work input and work output?
a)
Work = Force * Distance
b)
Mechanical Advantage = Resistance Force / Effort Force
c)
Efficiency = Work Output / Work Input * 100
d)
All of the above
56.
A 75 N bowling ball is carried horizontally across a 10 m room. How much work is done?
a)
0 J
b)
75 J
c)
750 J
d)
7500 J
57.
A force of 1 N moves a book 2 m. How much work is done?
a)
0.5 J
b)
1 J
c)
2 J
d)
3 J
58.
A force of 4.5 N is used to slide a book 2.7 J across a table. How far was the book moved?
a)
0.6 m
b)
1.0 m
c)
2.7 m
d)
4.5 m
59.
A child does 405 J of work to pull a sled 15 m up a hill. What force did the child exert on the sled?
a)
9 N
b)
15 N
c)
27 N
d)
40.5 N
60.
55,000 J of work is done to move a rock 25 m. What force was applied?
a)
1100 N
b)
2200 N
c)
5500 N
d)
11000 N
61.
What is the formula for Mechanical Advantage (MA) when considering the lengths of the effort and resistance arms?
a)
MA = Resistance Force / Effort Force
b)
MA = Length of Effort Arm / Length of Resistance Arm
c)
MA = Work Output / Work Input
d)
MA = Force Applied / Distance Moved
62.
If a rake has an input arm of 0.4 meters and an output arm of 1.0 meters, what is its mechanical advantage?
a)
0.4
b)
1.5
c)
2.5
d)
0.25
63.
How much work is done when a force of 1 N moves a book 2 m?
a)
0 J
b)
1 J
c)
2 J
d)
3 J
64.
What is the efficiency of a machine that requires 120 J of input energy to do 35 J of useful work?
a)
29.17%
b)
25%
c)
30%
d)
35%
65.
If a child does 405 J of work while pulling a sled up a hill over a distance of 15 m, what is the force exerted on the sled?
a)
27 N
b)
30 N
c)
25 N
d)
20 N
66.
A lever has an input arm of 4 meters and an output arm of 0.8 meters. What is its mechanical advantage?
a)
5
b)
4
c)
3
d)
2
67.
If a bulldozer does 567.6 J of work to push a mound of dirt 30.5 meters, what force does it apply?
a)
18.6 N
b)
20 N
c)
25 N
d)
30 N
68.
What is the mechanical advantage of a wheelbarrow if the input distance is 0.99 m and the output distance is 0.45 m?
a)
2.2
b)
1.5
c)
3.5
d)
1.2
69.
If a lever has an input arm of 3 meters and an output arm of 2 meters, what is its mechanical advantage?
a)
1.5
b)
2
c)
3
d)
0.67
70.
A child’s toy rake has an output arm of 0.75 meters and a mechanical advantage of 0.33. What is the length of the input arm?
a)
1.5 m
b)
2.25 m
c)
0.25 m
d)
0.5 m
71.
If a lever has a mechanical advantage of 4 and an input arm of 2 meters, what is the length of the output arm?
a)
0.5 m
b)
0.25 m
c)
0.75 m
d)
1 m
72.
What is the work done on a 75 N bowling ball when carried horizontally across a 10 m wide room?
a)
0 J
b)
750 J
c)
75 J
d)
1000 J
73.
If an input force of 202 N is applied to a wheelbarrow with a total weight of 444.4 N, what is the mechanical advantage?
a)
1.5
b)
2.2
c)
0.45
d)
0.33
74.
If a lever with an output arm of 0.8 meters has a mechanical advantage of 6, what is the length of the input arm?
a)
4.8 m
b)
5.6 m
c)
6.8 m
d)
7.2 m
75.
What is the work done when a force of 4.5 N moves a book and 2.7 J of work is performed?
a)
0.6 m
b)
0.5 m
c)
0.7 m
d)
0.8 m
76.
If a young boy applies a force of 2,550 N on his dog and is unable to move it, how much work did he do?
a)
0 J
b)
2550 J
c)
5100 J
d)
1275 J
77.
What is the mechanical advantage of a lever that lifts a rock weighing 350 N with a force of 50 N applied?
a)
5
b)
6
c)
7
d)
8
78.
If a wheelbarrow allows Amanda to lift 600 N of bricks with only 120 N of force, what is the mechanical advantage?
a)
4
b)
5
c)
6
d)
7
79.
If a bulldozer does 223 J of work to lift a rock with a force of 137 N, how far did the rock move?
a)
1.5 m
b)
2 m
c)
3 m
d)
4 m
80.
What is the efficiency of a cyclist who expends 900 J of work to produce 76 J of useful work?
a)
8.44%
b)
10.56%
c)
12.67%
d)
15.78%
81.
A 1500 kg car is westbound at a velocity of 33.0 km/h when it collides with a 2100 kg truck northbound at a velocity of 35 km/h. If these two vehicles lock together upon collision, what is the initial velocity of the vehicles after collision?
a)
12.0 km/h
b)
27.0 km/h
c)
33.5 km/h
d)
34.0 km/h
82.
A 3.8 kg object heading north at 3.0 m/s collides with a 7.0 kg object heading west at 3.5 m/s. If these two masses stick together upon collision, what is their velocity after collision?
a)
1.0 m/s
b)
2.0 m/s
c)
3.0 m/s
d)
3.25 m/s
83.
A 38000 N Truck moving west at a velocity of 7.0 m/s collides with a 28000 N truck heading south at a velocity of 5.0 m/s. If these two vehicles lock together upon impact, what is their velocity?
a)
4.0 m/s
b)
5.5 m/s
c)
6.0 m/s
d)
6.5 m/s
84.
A 70.0 kg object is moving east at an unknown velocity when it collides with a 60.0 kg stationary object. After collision, the 70.0 kg object is traveling at a velocity of 6.0 m/s 50.0o N of E and the 60.0 kg object is traveling at a velocity of 6.3 m/s 38oS of E. What was the velocity of the 70.0 kg object before collision?
a)
5.0 m/s
b)
7.5 m/s
c)
10.0 m/s
d)
12.0 m/s
85.
Determine whether the collision described in the previous question was elastic or inelastic.
a)
Elastic
b)
Inelastic
86.
A 14.0 kg penguin waddling east at a velocity of 7.0 m/s collides with a stationary 11.0 kg penguin. After the collision the 14.0 kg penguin is traveling at a velocity of 4.2 m/s 20.0o S of E. What is the velocity of the 11.0 kg penguin after collision?
a)
2.0 m/s
b)
3.5 m/s
c)
5.0 m/s
d)
6.0 m/s
87.
Determine whether the collision described in the previous question was elastic or inelastic.
a)
Elastic
b)
Inelastic
88.
A watermelon explodes into three equal masses. One mass moves east at 12.0 m/s. If a second mass moves at a velocity of 10.0 m/s 45.0o S of E, what is the velocity of the third mass?
a)
6.0 m/s
b)
8.0 m/s
c)
10.0 m/s
d)
12.0 m/s
89.
A 7.0 kg plate head explodes into three pieces. A 4.0 kg chunk flies off at 12.0 m/s 15o N of W and a 3.0 kg chunk sails at 8.0 m/s 35o E of S. What is the velocity of the final piece?
a)
5.0 m/s
b)
7.0 m/s
c)
9.0 m/s
d)
11.0 m/s
90.
A 1500 kg car is westbound at a velocity of 33.0 km/h when it collides with a 2100 kg truck northbound at a velocity of 35 km/h. If these two vehicles lock together upon collision, what is the initial velocity of the vehicles after collision?
a)
12.2 km/h
b)
23.4 km/h
c)
29.7 km/h
d)
34.1 km/h
91.
A 3.8 kg object heading north at 3.0 m/s collides with a 7.0 kg object heading west at 3.5 m/s. If these two masses stick together upon collision, what is their velocity after collision?
a)
2.0 m/s at 63.4 degrees
b)
2.5 m/s at 53.1 degrees
c)
3.0 m/s at 45.0 degrees
d)
3.3 m/s at 37.8 degrees
92.
A 38000 N Truck moving west at a velocity of 7.0 m/s collides with a 28000 N truck heading south at a velocity of 5.0 m/s. If these two vehicles lock together upon impact, what is their velocity?
a)
4.2 m/s at 53.1 degrees
b)
5.5 m/s at 45.0 degrees
c)
6.0 m/s at 36.9 degrees
d)
6.3 m/s at 29.1 degrees
93.
A 70.0 kg object is moving east at an unknown velocity when it collides with a 60.0 kg stationary object. After collision, the 70.0 kg object is traveling at a velocity of 6.0 m/s 50.0o N of E and the 60.0 kg object is traveling at a velocity of 6.3 m/s 38oS of E. What was the velocity of the 70.0 kg object before collision?
a)
8.0 m/s
b)
10.0 m/s
c)
12.0 m/s
d)
14.0 m/s
94.
A 14.0 kg penguin waddling east at a velocity of 7.0 m/s collides with a stationary 11.0 kg penguin. After the collision the 14.0 kg penguin is traveling at a velocity of 4.2 m/s 20.0o S of E. What is the velocity of the 11.0 kg penguin after collision?
a)
2.8 m/s at 20.0 degrees S of E
b)
4.0 m/s at 25.0 degrees S of E
c)
5.1 m/s at 30.0 degrees S of E
d)
6.3 m/s at 35.0 degrees S of E
95.
A watermelon explodes into three equal masses. One mass moves east at 12.0 m/s. If a second mass moves at a velocity of 10.0 m/s 45.0o S of E, what is the velocity of the third mass?
a)
4.0 m/s at 45.0 degrees N of E
b)
6.0 m/s at 45.0 degrees N of E
c)
8.0 m/s at 45.0 degrees N of E
d)
10.0 m/s at 45.0 degrees N of E
96.
A 7.0 kg plate head explodes into three pieces. A 4.0 kg chunk flies off at 12.0 m/s 15o N of W and a 3.0 kg chunk sails at 8.0 m/s 35o E of S. What is the velocity of the final piece?
a)
2.5 m/s at 25.0 degrees E of N
b)
4.0 m/s at 30.0 degrees E of N
c)
6.0 m/s at 35.0 degrees E of N
d)
8.0 m/s at 40.0 degrees E of N
97.
What is the initial velocity of the combined vehicles after the collision of a 1500 kg car moving west at 33.0 km/h and a 2100 kg truck moving north at 35 km/h?
a)
15.0 km/h at 45° NE
b)
20.0 km/h at 30° NW
c)
25.0 km/h at 60° SW
d)
30.0 km/h at 90° N
98.
After a collision, what is the velocity of a combined mass of 10.8 kg (3.8 kg object at 3.0 m/s north and 7.0 kg object at 3.5 m/s west)?
a)
2.5 m/s at 30° NW
b)
3.0 m/s at 45° SW
c)
3.5 m/s at 60° NE
d)
4.0 m/s at 15° SE
99.
What is the final velocity of two trucks (38,000 N moving west at 7.0 m/s and 28,000 N moving south at 5.0 m/s) after they collide and lock together?
a)
3.5 m/s at 45° SW
b)
4.0 m/s at 30° NW
c)
5.0 m/s at 60° NE
d)
6.0 m/s at 15° SE
100.
What was the initial velocity of a 70.0 kg object moving east before colliding with a stationary 60.0 kg object, given the final velocities after collision?
a)
5.0 m/s
b)
6.0 m/s
c)
7.0 m/s
d)
8.0 m/s
101.
Is the collision between the 70.0 kg object and the 60.0 kg stationary object elastic or inelastic?
a)
Elastic
b)
Inelastic
c)
Perfectly elastic
d)
Perfectly inelastic
102.
What is the velocity of the 11.0 kg penguin after colliding with a 14.0 kg penguin moving at 7.0 m/s east?
a)
2.0 m/s at 10° N of E
b)
3.0 m/s at 20° S of E
c)
4.0 m/s at 30° N of E
d)
5.0 m/s at 40° S of E
103.
Is the collision between the two penguins elastic or inelastic?
a)
Elastic
b)
Inelastic
c)
Perfectly elastic
d)
Perfectly inelastic
104.
What is the velocity of the third mass after a watermelon explodes into three equal masses, with one moving east at 12.0 m/s and another at 10.0 m/s 45° S of E?
a)
5.0 m/s at 30° N of W
b)
6.0 m/s at 15° S of W
c)
8.0 m/s at 60° N of E
d)
10.0 m/s at 75° S of W
105.
What is the final velocity of the last piece of a 7.0 kg plate head that explodes into three pieces, given the velocities of the other two pieces?
a)
4.0 m/s at 15° N of W
b)
5.0 m/s at 30° E of S
c)
6.0 m/s at 45° S of E
d)
7.0 m/s at 60° N of W
106.
In a perfectly inelastic collision, what happens to the kinetic energy of the system?
a)
It is conserved
b)
It is lost
c)
It increases
d)
It is transformed into potential energy
107.
What principle is used to solve collision problems involving momentum?
a)
Conservation of energy
b)
Conservation of momentum
c)
Newton's second law
d)
Frictional force
108.
If two objects collide and stick together, what type of collision is it?
a)
Elastic
b)
Inelastic
c)
Perfectly elastic
d)
Super elastic
109.
What is the total momentum of a system before and after a collision?
a)
It can change
b)
It is always zero
c)
It is conserved
d)
It depends on external forces
110.
When analyzing a two-dimensional collision, what must be considered?
a)
Only the x-direction
b)
Only the y-direction
c)
Both x and y directions
d)
Neither x nor y directions
111.
What happens to the momentum of an object if no external forces act on it?
a)
It increases
b)
It decreases
c)
It remains constant
d)
It becomes zero
112.
In a collision, if one object has a larger mass than the other, how does it affect the final velocities?
a)
It has no effect
b)
The larger mass moves faster
c)
The smaller mass moves faster
d)
The larger mass has more influence
113.
What is the effect of an elastic collision on the relative velocity of approach and separation?
a)
They are equal
b)
They are opposite
c)
They are unrelated
d)
They are additive
114.
Which of the following best describes an elastic collision?
a)
Kinetic energy is conserved
b)
Momentum is not conserved
c)
Both kinetic energy and momentum are lost
d)
Only momentum is conserved
115.
In a two-dimensional collision, how do you determine the final velocity of the combined masses?
a)
By averaging their initial velocities
b)
Using the conservation of momentum equations
c)
By adding their masses
d)
By calculating their kinetic energies
116.
What is the significance of the angle in a collision problem?
a)
It determines the speed
b)
It affects the direction of momentum
c)
It has no significance
d)
It only matters in elastic collisions
117.

A 5 kg object is moving at 10 m/s. What is its kinetic energy?

a)

250 J

b)

500 J

c)

750 J

d)

1000 J

118.

A lever has an effort arm of 2 meters and a resistance arm of 0.5 meters. What is the mechanical advantage of the lever?

a)

0.25

b)

1.0

c)

2.0

d)

4.0

119.

A 10 kg mass is lifted to a height of 5 meters. What is the potential energy of the mass at this height? (Assume g = 9.8 m/s²)

a)

49 J

b)

98 J

c)

490 J

d)

980 J

120.
What has to happen when a force is exerted on an object for work to be done?
a)
the object moves
b)
the object stays still
c)
the object is heavy
d)
none of these
121.
What is kinetic energy?
a)
stored energy
b)
energy of motion
c)
energy of friction
d)
energy stored in chemical bonds
122.
How do we express the total amount of energy a moving object has?
a)
KE x PE
b)
KE + PE
c)
KE - PE
d)
KE / PE
123.
What type of energy represents the sum of the KE and PE that a moving object has?
a)
chemical energy
b)
total mechanical energy
c)
electromagnetic energy
d)
electrical energy
124.
When a roller coaster cart falls towards the ground, what happens to its potential energy?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Nothing
125.
When a rollercoaster cart moves towards the ground, what happens to the PE that it has?
a)
It transforms into KE
b)
It leaves the system
c)
Nothing
d)
It stays PE
126.
What is the kinetic energy of a ball sitting on top of a hill?
a)
0 J
b)
less than 0 J
c)
more than 0 J
127.
The Law of Conservation of Energy states that total amount of energy in a closed system will always
a)
stay the same
b)
increase
c)
decrease
d)
cannot be determined
128.
Based on the formula for potential energy, what 2 variables influence PE the most?
a)
mass and height
b)
mass and velocity
c)
velocity and height
d)
velocity and mass
129.
In order for work to be done, what must be true?
a)
Force acts in the same direction as the distance traveled.
b)
Force and distance are in opposite directions.
c)
Force is greater than distance.
d)
Distance is greater than force.
130.
When you carry an object, is work done on it?
a)
Yes, force is applied in the same direction as the distance it travels.
b)
No, force is applied in a different direction than distance traveled.
131.
In which situation is NO work done?
a)
picking up a book bag
b)
dropping the bookbag
c)
carrying the bookbag
d)
none of these
132.
What is being transferred as you do work?
a)
Energy
b)
Heat
c)
Power
d)
Gravitational Potential Energy
133.
How do we calculate work?
a)
W = F * d
b)
w = f * D
c)
W = F * D
d)
w = f * d
134.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
135.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
136.
What is the formula for Gravitational Potential Energy?
a)
PE = m*g*h
b)
KE = 1/2m*v2
c)
W = F*d
d)
P = W/t
137.
What is the formula for Kinetic Energy?
a)
PE = m*g*h
b)
KE = 1/2m*v2
c)
W = F*d
d)
P = W/t
138.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
139.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
140.

The momentum of a 0.20 kg ball going towards a batter is 8.2 kg m/s. The hitter bunts the ball with his 1.4 kg bat. If the bat travels at in the direction of the ball after the bunt at 3.4 m/s, what is the momentum of the bat after the collision?

a)

8.1 joules

b)

-8.2 kg m/s

c)

1.3 kg m/s

d)

-4.8 kg m/s

141.

The momentum of a 0.20 kg ball going towards a batter is 8.2 kg m/s. The hitter bunts the ball with his 1.4 kg bat. If the bat travels at in the direction of the ball after the bunt at 10.25 m/s, what is the total momentum of the system after the collision?

a)

8.2 kg m/s

b)

20.4 kg m/s

c)

-6.15 kg m/s

d)

14.35 kg m/s

142.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s.


What is the momentum of the Tesla before the crash?

a)

14,000 kg m/s

b)

19,800 kg m/s

c)

33,800 kg m/s

d)

47,900 kg m/s

143.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s.


What is the momentum of the Dodge Ram before the crash?

a)

0 kg m/s

b)

14,000 kg m/s

c)

19,800 kg m/s

d)

33,800 kg m/s

144.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s.


What is the momentum of the Dodge Ram after the crash?

a)

0 kg m/s

b)

14,000 kg m/s

c)

19,800 kg m/s

d)

33,800 kg m/s

145.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s.


What is the momentum of the Tesla after the crash?

a)

0 kg m/s

b)

14,000 kg m/s

c)

19,800 kg m/s

d)

33,800 kg m/s

146.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s.


What is the momentum of the two vehicles once they are stuck together after the crash?

a)

0 kg m/s

b)

14,000 kg m/s

c)

19,800 kg m/s

d)

33,800 kg m/s

147.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s.


Momentum (a)   (is/is not) conserved in this crash.

148.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s. The vehicles came to a stop in 4.78 m.


What was the stopping acceleration?

a)

0 m/ s2s^2

b)

-4.03 m/undefined

c)

-4.78 m/undefined

d)

-9.81m/undefined

149.

A 2 250 kg Tesla going 15.0 m/s collides with a parked 3 190 kg Dodge Ram. During the collision they stick together as they deform. The two vehicles then travel at 6.20 m/s. The vehicles came to a stop in 4.78 m. It takes a stopping acceleration of 36 g's to deploy the aribags. The airbags (a)   (did/did not) deploy during this crash.

150.

When you sneeze you release tiny (mostly) water droplets. As the sneeze leaves your head it must impart momentum on you. If your head is about 4.75 kg and the momentum of the sneeze was about 0.245 kg m/s, what speed will your head travel from the kick back?

a)

0.323 km/hr

b)

0.186 km/hr

c)

1.16 km/hr

d)

19.4 km/hr

151.

When you sneeze you release tiny (mostly) water droplets. These droplets can travel at extream speeds from 75 km/hr to 1045 km/hr. Let's assume that you sneeze 0.549 g of droplets at a speed of 44.7 m/s. What is the momentum of the sneeze?

a)

24.5 kg m/s

b)

159 kg m/s

c)

0.0245 kg m/s

d)

0.159 kg m/s

152.

When you sneeze you release tiny (mostly) water droplets. As the sneeze leaves your head it must impart momentum on you. If your head is about 4.75 kg and the momentum of the sneeze was about 0.245 kg m/s, what speed will your head travel from the kick back?

a)

0.323 km/hr

b)

0.186 km/hr

c)

1.16 km/hr

d)

19.4 km/hr

153.

The angular momentum of an object changes from 9.0 𝑘𝑔𝑚!/𝑠 to 6.0 𝑘𝑔𝑚!/𝑠 in 10 s. What is the torque causing the change?

a)

0.3 Nm

b)

1.3Nm

c)

2.5Nm

d)

4.1Nm

154.

Calculate the angular velocity of a car tire with a radius of .31m traveling a speed of 22 m/s (ones Place)

(a)  

155.

The Gravitron starts from rest and accelerates to .5 rotation per second before the floor drops, approximately 2 minutes into the ride. what is the angular acceleration ? (hundreths place) 



(a)  

156.

How many radians make up one revolution of 360 degrees?

a)

π/2

b)

π

c)

2π

d)

3π/2

157.
A pitcher's arm is rotating at 500 deg/s and comes to a stop in 0.13 seconds. What was the average angular acceleration?
a)
3846 deg/s/s (-)
b)
3846 deg/s/s (+)
c)
500 deg/s/s (-)
d)
500 deg/s/s (+)
e)
blank
158.

A lever has an input force of 50 N and an output force of 200 N. What is the mechanical advantage of the lever?

a)

2

b)

3

c)

4

d)

5

159.

A wheel rotates at 10 degrees per second for 6 seconds. What is the total angular displacement?

a)

50 degrees

b)

60 degrees

c)

70 degrees

d)

80 degrees

160.

A pulley system lifts a 500 N weight with an effort of 100 N. What is the mechanical advantage of the system?

a)

3

b)

4

c)

5

d)

6

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