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Dynamics Review

Total questions: 63

Worksheet time: 44mins

Name
Class
Date
1.

What is the formula to calculate net force?

a)

Net Force = F1 / F2 / F3 / ...

b)

Net Force = ΣF = F1 + F2 + F3 + ...

c)

Net Force = F1 x F2 x F3 x ...

d)

Net Force = F1 - F2 - F3 - ...

2.

When forces are balanced, what is the overall effect on an object's motion?

a)

The object will maintain its current state of motion.

b)

The object will stop moving

c)

The object will accelerate indefinitely

d)

The object will change direction

3.

If a 10 N force is applied to the right and a 5 N force is applied to the left, what is the net force?

a)

15 N

b)

3 N

c)

8 N

d)

5 N

4.

How can you determine the direction of the net force when multiple forces are acting on an object?

a)

Divide the forces by the number of objects

b)

Choose the force with the highest magnitude

c)

Calculate the vector sum of all individual forces to determine the direction of the net force.

d)

Ignore all forces except the largest one

5.

What is the net force on an object if two forces of 8 N and 3 N are acting in the same direction?

a)

11 N

b)

10 N

c)

2 N

d)

5 N

6.

Explain the concept of frictional force and its effect on motion.

a)

Frictional force slows down or stops the motion of an object by creating resistance between the object and the surface it is moving on.

b)

Frictional force causes objects to float

c)

Frictional force has no effect on motion

d)

Frictional force increases the speed of an object

7.

If an object is moving to the right with a force of 15 N and friction is acting to the left with a force of 5 N, what is the net force?

a)

5 N

b)

12 N

c)

10 N

d)

20 N

8.

What type of force is required to overcome frictional force?

a)

Applied force

b)

Magnetic force

c)

Gravitational force

d)

Frictional force

9.

Explain the difference between balanced and unbalanced forces in relation to an object's motion.

a)

Balanced forces always result in the object moving in the direction of the greater force

b)

Unbalanced forces cancel each other out, resulting in no motion of the object

c)

Balanced forces lead to a net force causing the object to move in the direction of the greater force

d)

Balanced forces cancel each other out, resulting in no net force acting on the object, whereas unbalanced forces lead to a net force causing the object to move in the direction of the greater force.

10.

Explain the concept of inertia and its relationship to an object's motion.

a)

Inertia is the resistance of an object to change its state of motion, and it is directly proportional to the object's mass.

b)

Inertia is the force that causes objects to move, and it is inversely proportional to the object's mass.

c)

Inertia has no effect on an object's motion.

d)

Inertia increases the speed of an object.

11.

What happens to the acceleration of an object if the mass is doubled while the force remains constant?

a)

The acceleration doubles.

b)

The acceleration is halved.

c)

The acceleration remains constant.

d)

The acceleration becomes negative.

12.
A family of four go bowling.  Each family member bowls with the same force but use different bowling balls.  Which bowling ball had the greatest change of speed?
a)
Bowling ball with 16 kg
b)
Bowling ball with 20 kg
c)
Bowling ball with 24 kg
d)
Bowling ball with 28 kg
13.

___?___ doesn't change with changes in gravity.

a)

weight

b)

mass

c)

both change

d)

neither change

14.

The unit used to express momentum

a)

kg●m/s

b)

Newton

c)

kg●m

d)

kg

15.

How much force is needed to accelerate a 75kg object 2 m/s2?

a)

37.5 N

b)

150 N

c)

47.5kg

d)

150kg

16.

What is the mass of an object that requires a 500N force to accelerate it at 5m/s2?

a)

5kg

b)

25kg

c)

75kg

d)

100kg

17.

What velocity is a 2kg object traveling at if its momentum is 51 kg.m/s?

a)

102m/s

b)

102m/s2

c)

25.5m/s

d)

25.5m/s2

18.

What is the momentum of an object with a mass of 4kg that is traveling at 60m/s?

a)

15kg.m/s

b)

15 kg.m/s2

c)

240 kg.m/s

d)

240 kg.m/s2

19.

What is the mass of an object that requires 14N of force to be applied to reach an acceleration of 2m/s2?

a)

7m

b)

7kg

c)

7m/s

d)

7m/s2

20.

An object at rest stay at rest and an object in motion stays in motion until acted upon by an unbalanced force.

a)

Newton's 3rd Law

b)

Force

c)

Newton's 2nd Law

d)

Newton's 1st Law

21.

The acceleration of an object as produced by net force. F = m*a

a)

Newton's 1st Law

b)

Motion

c)

Newton's 2nd Law

d)

Newton's 3rd Law

22.

For every action there is an equal and opposite reaction.

a)

Newton's 2nd Law

b)

Newton's 1st Law

c)

Newton's 3rd Law

d)

None of the above

23.
A soccer ball accelerates more than a bowling ball when thrown with the same force.
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
None of them
24.

You fly to Venus and research if life can exist there. Your mass is 100 kg and have a weight of 90 N what is the Gravitational strength of Venus? (Solve for g)

a)

900 N/kg

b)

9 N/kg

c)

0.9 N/kg

d)

9000 N/ kg

25.

Find the mass of a 5kg rock on Mercury with a gravitational pull of 3.59m/s/s.

a)

5kg

b)

17.95N

c)

1.39N

d)

0.718N

26.

Find the weight of a 5kg rock on Mercury with a gravitational pull of 3.59m/s/s.

a)

5kg

b)

17.95N

c)

1.39N

d)

0.718N

27.

The momentum of an object depends upon the object's ___________&_____________.

a)

size and shape

b)

mass and speed

c)

mass and veloctiy

d)

mass and energy

28.

The momentum of an object depends upon the object's ___________&_____________.

a)

size and shape

b)

mass and speed

c)

mass and veloctiy

d)

mass and energy

29.
Softer landings tend to
a)
increase impact force
b)
increase force
c)
increase collision time
d)
increase change in momentum
30.
In any collision (crash) the ______ is ALWAYS constant.
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
31.

Which one of these objects has the greater amount of momentum?

a)

A turtle that slowly crosses a road

b)

A parked car

c)

A stop sign

32.

An egg landing on a soft surface will remain intact. The surface increases the _____ and decreases the _____ during the impact

a)

impulse, time

b)

impulse, force

c)

force, time

d)

time, force

33.

Padded dashboards in cars are safer in accidents than non padded ones because the passenger hitting the dash has...

a)

a) Increased time of impact

b)

b) decreased impulse

c)

c) decreased impact force

d)

d) a and b

e)

e) a and c

34.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
35.
A 10kg toy truck moves at 5m/s East. It collides head-on with a 5kg toy car moving 10 m/s moving west. What is the total momentum of the system?
a)
0 kgm/s
b)
30 kgm/s
c)
50 kgm/s
d)
10 kgm/s
36.

Define elastic collision.

a)

A collision in which kinetic energy and momentum are conserved

b)

A collision in which kinetic energy is converted to potential energy

c)

A collision in which kinetic energy is not conserved

d)

A collision in which momentum is not conserved

37.

Explain the concept of impulse.

a)

Impulse is the change in momentum of an object when a force is applied for a certain amount of time.

b)

Impulse is the speed of an object

c)

Impulse is the force applied to an object

d)

Impulse is the same as momentum

38.

What is the relationship between impulse and change in momentum?

a)

Impulse is equal to the change in momentum.

b)

Impulse has no effect on the change in momentum.

c)

Impulse is inversely proportional to the change in momentum.

d)

Impulse is directly proportional to the change in momentum.

39.

In an inelastic collision, what happens to the kinetic energy of the system?

a)

It becomes negative

b)

It increases

c)

It remains constant

d)

It decreases

40.

State the law of conservation of momentum.

a)

The total momentum of a closed system remains constant if no external forces act on it.

b)

The total momentum of a closed system decreases over time

c)

The total momentum of a closed system increases over time

d)

The law of conservation of momentum only applies to open systems

41.

What is the difference between elastic and inelastic collisions?

a)

In elastic collisions, momentum is not conserved, while in inelastic collisions, momentum is conserved.

b)

In elastic collisions, kinetic energy is conserved, while in inelastic collisions, kinetic energy is not conserved.

c)

In elastic collisions, the objects stick together after the collision, while in inelastic collisions, the objects bounce off each other.

d)

In elastic collisions, the objects lose energy, while in inelastic collisions, the objects gain energy.

42.

Collision where objects collide, and stick together.

a)

inelastic collision

b)

explosion

c)

elastic collision

d)

none of these

43.
An object with a mass of 2000 kg at rest has what momentum?
a)
2000 kg m/sec
b)
0 kg m/sec
c)
2000 kg
d)
2000 m/sec
44.

The momentum before objects collide is always written as:

a)

m1m2+v1,iv2,im_1m_2+v_{1,i}v_{2,i}

b)

m1v1,i+m2v2,im_1v_{1,i}+m_2v_{2,i}

c)

12m1v1,i2+12m2v2,i2\frac{1}{2}m_1v_{1,i}^2+\frac{1}{2}m_2v_{2,i}^2

d)

(m1+m2)vf\left(m_1+m_2\right)v_f

45.

The momentum after objects collide in a perfectly inelastic collision is written as:

a)

m1m2+v1,iv2,im_1m_2+v_{1,i}v_{2,i}

b)

m1v1,i+m2v2,im_1v_{1,i}+m_2v_{2,i}

c)

12m1v1,i2+12m2v2,i2\frac{1}{2}m_1v_{1,i}^2+\frac{1}{2}m_2v_{2,i}^2

d)

(m1+m2)vf\left(m_1+m_2\right)v_f

46.

Conservation of momentum means that the initial and final momentum in a collision are

a)

different

b)

the same/equal

c)

impossible to determine

d)

always the same as the kinetic energy

47.

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. If the first boxcar is at rest after the collision, what speed will the second boxcar move?

a)
18.6 m/s
b)
9.3 m/s
c)
7.5 m/s
d)
1.86 m/s
48.

A fishing tackle box is at rest on a bench that is tipped at an angle of 26°. If the force of static friction is 2.4 N, what is the weight of the tackle box?

a)

0.54 N

b)

2.2 N

c)

2.7 N

d)

5.5 N

49.

A robotic arm lifts a stack of cafeteria trays weighing 62 newtons (N). It moves the trays 2 meters (m). How much work has the robotic arm performed?

a)
31 Joules
b)
124 Joules
c)
1240 Joules
d)
62 Joules
50.

A force of 12 N is used to lift a box 0.5 meters above a floor. What amount of work was done to lift the box?

a)
12 J
b)

24 J

c)
9 J
d)
6 J
51.
Calculate the Net Force. 
a)
40N, Left
b)
40N, Right
c)
0N, Balanced
d)
75N, Right
52.
What is the net force and direction on the box?
a)
6 Newtons Up
b)
6 Newtons Down
c)
6 Newtons Left
d)
6 Newtons Right
53.

If Chris is pushing to the right with a force of +78N and Julia is pulling to the right with a force of +22N, what is the net force on the box. Use right as positive and left as negative. Round to one decimal place. Do not write units!

54.

Susan and Joe push a table 18 meters down a hall by exerting a force of 200 newtons (N). What is the total amount of work done on the table?

a)
1800 J
b)
3600 J
c)
2400 J
d)
3000 J
55.

Peter does 3,000 joules (J) of work by moving an object 40 meters (m). What is the force that Peter applies to the object?

a)
100 N
b)
75 N
c)
90 N
d)
60 N
56.

A 12-g ball moving 4.0 m/s​ collides head-on and inelastically with a second 12-g ball initially at rest. After colliding, the balls move together at the speed

a)
4.0 m/s
b)
2.0 m/s
c)
3.0 m/s
d)
1.0 m/s
57.

A 3.00-kg cart with an initial velocity of +4.00 m/s collides inelastically with a 5.00-kg cart with an initial velocity of +2.00 m/s. The carts stick together when they collide. What is their speed after colliding?

a)
2.75 m/s
b)
3.50 m/s
c)
4.00 m/s
d)
1.50 m/s
58.

A 2-kg ball with an initial speed of 4ms4sm​ sticks to a wall after colliding with the wall. How much kinetic energy is lost during the collision?

a)
12 J
b)
20 J
c)
8 J
d)
16 J
59.

A 10 N force is applied to a 2 kg block for 6 seconds. During the third second, which property increases in the block?

a)

inertia

b)

momentum

c)
Mass
d)

acceleration

60.

A 1000 kg car accelerates from 2.0 m/s to 6.0 m/s in 5.0 s. What is the magnitude of the car’s final momentum?

a)
2000 kg·m/s
b)
8000 kg·m/s
c)
6000 kg·m/s
d)
4000 kg·m/s
61.

An object with a weight of 19.6 N moves with a constant velocity of 20.0 m/s. A net force of 6.00 N is applied to the object in the direction of its motion for 4.00 seconds. What is the final momentum of the object?

a)
50 kg·m/s
b)
64 kg·m/s
c)
80 kg·m/s
d)
30 kg·m/s
62.

A 12 kg mass, moving at 16 m/s, experiences an opposing force of 18 N for 3.0 s. What is the magnitude of the change in momentum of the object?

a)
54 kg*m/s
b)
18 kg*m/s
c)
72 kg*m/s
d)
36 kg*m/s
63.

A 61,000-kg Rocky Mountain Double big rig is traveling at 0.5 m/s. About what velocity must a 730-kg compact electric vehicle have to achieve the same amount of momentum as the Rocky Mountain Double?

a)

41.78 m/s

b)
32.8 m/s
c)
25.3 m/s
d)
15.5 m/s

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