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WorksheetsReview 2 - Physics Finals
Total questions: 65
Worksheet time: 2hrs 12mins
An object has mass, m, and velocity, v. Which change would make its momentum become one-fourth as much?
Its mass remains m and its velocity becomes v/2.
Its mass becomes m/2 and its velocity becomes 2v.
Its mass becomes m/2 and its velocity becomes v/2.
Its mass becomes m/3 and its velocity remains v.
Jakob walks on the sidewalk at a constant speed for 1 minute. Then he stops for 2 minutes to tie his shoes. Then he continues to walk for an additional minute. Then he stops for 2 minutes to pet a dog. Which graph represents Jakob’s motion?
graph A
graph B
graph C
graph D
What is the starting point of the object?
2 m
4 m
10 m
20 m
To determine how fast an object is moving on a Position-time graph I should...
Look at the vertical axis at that time
Look at the steepness of the line (slope)
Look at if the slope is positive or negative
Look at the direction of the curvature, if any
A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the cars velocity?
A
B
C
D
When a glass rod is rubbed with silk and the rod becomes positively charged,
Electrons are removed from the rod
The silk remains neutral
Protons are added to the silk
Protons are removed from the silk
Which of the following best represents the difference between gravitational and electric forces?
Gravitational force is stronger than electric force.
Electric force can both attract and repel.
Electric force is inversely proportional to the square of the distance between objects.
Gravitational force exists between objects that are not touching.
A cart is constrained to move along a straight line. A varying net force along the direction of motion is exerted on the cart. The cart’s velocity v as a function of time t is shown in the graph above. The five labeled points divide the graph into four sections.
During some part of the motion, the work done on the cart is negative. What feature of the motion indicates this?
The speed is decreasing.
The speed is increasing.
The acceleration is negative.
The acceleration is positive.
What is the KE 3/4th of the way down?
15,000 J
3,750 J
7,500 J
11,250 J
Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...
Skater 1 experiences a greater change in momentum
Skater 2 experiences a greater change in momentum
Skater 1 has a greater speed than Skater 2
Skater 1 experiences a greater force
This type of wave occurs when wave motion moves perpendicular to the medium.
Transverse Wave
Longitudinal Wave
Surface Wave
Tidal Wave
Waves are a transfer of what?
Heat
Light
Energy
Food
Wavelength= 2.0m
Frequency= _________
The image produced in a plane mirror will always be...
virtual
real
A car moves in a horizontal circle with a radius of 10 m. The tangential velocity of the car is 30 m/s. What is the car's acceleration?
3 m/s2 toward the center
3 m/s2 away from the center
90 m/s2 toward the center
90 m/s2 away from the center
270 m/s2 toward the center
The centripetal acceleration on a 1000-kg car in a turn is 1 x 105 m/s2. The radius of the turn in 10 m. What is the car's speed?
10 m/s
100 m/s
1000 m/s
10000 m/s
100,000 m/s
At what time does car A return to its original position?
5 s
10 s
15 s
20 s
Never
At what time do the cars have the same speed going in the same direction?
0 s
5 s
10 s
5 s and 15 s
10 s and 20 s
What is the object's displacement after 2 seconds based on the velocity-time graph?
3 m
4 m
5 m
6 m
7 m
The figure above shows the forces exerted on a block that is sliding on a rough horizontal surface: The weight of the block is 500 N, (take g = 10 m/s2) the normal force is 500 N, the frictional force is 100 N, and there is an unknown force F exerted to the right. The acceleration of the block is 0.4 m/s2. The value of F is most nearly
20 N
80 N
110 N
120 N
Given the net forces on and the masses of the blocks shown above, which two blocks have the same acceleration? Select two answers
Block A
Block B
Block C
Block D
The diagram above shows the forces exerted on an object. Which of the following dot diagrams best represents the position of the object at equal time intervals?
A 2 kg object is initially at rest at time t = 0s. It then slides across a rough, horizontal surface under the influence of only the four forces shown in the table above. What is the speed of the object at time t = 3s ?
12 m/s
14 m/s
24 m/s
36 m/s
All the trailers and cars are identical but they have different loads. In each case the boat and the trailer are moving at a constant speed in a straight line. Rank the magnitude of the net force in each case.
A = B = C > D
C > A = D >B
B > A > C = D
A = B= C= D
An object is thrown with an initial speed v near the surface of Earth. Assume that air resistance is negligible and the gravitational field is constant.
If the object is thrown vertically upward, the direction and magnitude of its acceleration while it is in the air is
upward and decreasing
upward and constant
downward and decreasing
downward and increasing
downward and constant
If the only force acting on an electron is due to a uniform electric field, the electron moves with constant
acceleration in a direction opposite to that of the field
acceleration in the direction of the field
acceleration in a direction perpendicular to that of the field
speed in a direction opposite to that of the field
speed in the direction of the field
Which diagram correctly shows the field lines between two like (same) charges?
A
B
Both
Neither
If one of the charges doubles, what happens to the force?
it doubles
it gets cut in half
it quadruples
it is cut by 1/4
If one of the charges doubles, what happens to the force?
it doubles
it gets cut in half
it quadruples
it is cut by 1/4
The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the magnitude of charge on q2 doubles?
9.6 N
4.8 N
1.2 N
.6 N
What effect does increasing the distance between the two objects do to the gravitational force?
The distance between two objects has no effect on the gravitational force
It increases
It stays the same
It decreases
When do gravitational forces exist between two objects?
They only exist between microscopic objects.
They are always present between any two objects.
Gravitational forces only act on objects falling on Earth.
They only exist for objects in space.
Calculate the gravitational force between a 15-kg chinchilla and a 65-kg dog which are separated by 0.30 m.
Fg = 3.7*10-8 N
Fg = 1.3*1012 N
Fg = 1.1*105 N
Fg = 7.2*10-7 N
Why do we not feel a gravitational attraction to the objects around us?
The masses are too small for the Fg value to be noticeable
Gravitational forces are not found on Earth
The radius between us and the objects is too great
Electrical forces overpower the gravitational forces
A molecule of mass m bounces off molecule of mass 1.5m. If no kinetic energy was lost in this collision, what kind of collision is this?
Elastic
Inelastic
Why is it good to bend your knees when you land?
More time, less force
More time, more force
More time, less impulse
More time, more impulse
A 3 kg box is traveling at 9 m/s. Then, it experiences a net force. Afterwards, it traveling at 4 m/s. How much magnitude of impulse did the box experience?
39 Ns
27 Ns
15 Ns
12 Ns
A 2 kg cart is traveling at 4 m/s. It hits and sticks to a 6 kg cart that was originally at rest. What is the new speed of the two-cart system?
4 m/s
2 m/s
1 m/s
0 m/s
A box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, brings the block to rest at point B, 19 m to the right of point A. What is the coefficient of kinetic friction of the surface from A to B?
0.11
0.26
0.33
0.47
Compared to a 3-Ohm resistor, a 6-Ohm resistor has
1/4 the power
1/2 the power
2 times the power
4 times the power
Five wires are made of the same material. Which wire would give the least resistance?
A
B
C
D
E
At what point is vx= 0 m/s?
A
B
C
D
None of these points
