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WorksheetsAP Physics Forces Review
Total questions: 25
Worksheet time: 23mins
Inertia is entirely based on an object's:
Speed
Size
Mass
Volume
What is the relationship between the force the cannon puts on the ball and the force the ball puts back on the cannon?
The force on the ball is greater
The force on the cannon is greater
The forces are equal
The forces are unequal, but it's impossible to say which way
Which of the following is an example of action-at-a-distance?
Applied Forces
The Force of Gravity
The Normal Force
The Force of Tension
Which of the following is an example of a contact force?
The force of gravity
Electric forces
The force of friction
Magnetic forces
When a kangaroo jumps, the kangaroo applies an action force on the ground. Which of the following is true regarding the action force? Select two answers.
Is greater than the action force
Is equal to the action force
Cancels out the action force
Is exerted by the ground
How would you find the vertical component of F1?
20.0 * sin(35)
20.0 * cos(35)
20.0 * tan(35)
20.0 * (35)
How would you find the horizontal component of F1?
20.0 * sin(35)
20.0 * cos(35)
20.0 * tan(35)
20.0 * (35)
A biker travels at constant velocity. All of the following are true except:
The force of friction acts opposite the direction of his motion.
The force of friction is equal to the forward force he applies.
He has a net force acting on him.
The normal force is equal to his weight.
A stick is used to hit a ball at an angle above the horizontal, as shown in Figure 1. Figure 2 shows the free body diagram of the ball. Figure 3 shows the free body diagram of the stick. Which of the following pairs of forces represents an action-reaction pair and the object or objects involved in the action-reaction pair?
Fstick and Fball
Fg of stick and Fg of ball
Fstick and Fg of ball
Fball and Fg of stick
A falling skydiver opens his parachute. A short time later, the weight of the skydiver-parachute system and the drag force exerted on the system are equal in magnitude. Which of the following statements predicts the motion of the skydiver at this time?
The skydiver is at rest.
The skydiver is moving downward with constant speed.
The skydiver is moving downward with an upward acceleration.
The skydiver is moving downward with a downward acceleration.
A block is pulled along a surface of negligible friction by a spring scale that exerts a force F on the block. The mass of the block is 4kg, and the spring scale reads 10N. Which of the following free-body diagrams can be used to show the magnitude and direction of all the forces exerted on the block as it is pulled along the surface?
A student must determine the inertial mass of a block that is pulled across a horizontal surface using a force probe and an accelerometer. The student’s data are represented in the graph above. What must the student do to determine the inertial mass of the block?
Determine the y-intercept.
Calculate the slope.
Calculate the area under the line.
Determine the x-intercept.
Three objects can only move along a straight, level path. The graphs below show the position d of each of the objects plotted as a function of time t.
The sum of the forces on the object is zero in which of the cases?
II only
III only
I & II only
I & III only
All of the above
A water-skier with weight Fg = mg moves to the right with acceleration a. A horizontal tension force T is exerted on the skier by the rope, and a horizontal drag force Fd is exerted by the water on the ski. The water also exerts a vertical lift force L on the skier. Which of the following are correct relationships between the forces exerted on the skier-ski system? Select two answers.
T − Fd = ma
L − Fg = ma
L − Fg = 0
T − Fd = 0
Given the FBD, which of the following must be true?
The box must be accelerating to the left.
The box must be accelerating to the right.
The box must be moving to the left.
The FBD is incorrectly drawn. This situation isn't possible
Regarding the system showed in the picture, which of the following statements is FALSE?
T3 is equal to the scalar sum of the magnitudes of T2 and T1
T3 is equal in magnitude to Fg
The x- components of the T1 and T2 and equivalent but in opposite directions
The system is in equilibrium.
A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them. Which of Newton's Laws best explains how this is possible?
None of the above; this is best explained by static friction
A 25 kg sign is suspended from three cables which are connected point D. These cables are cable AD, cable BD, and cable CD. What is the tension in cable BD (the horizontal cable)?
176.775 N
250 N
353.557 N
500 N
125 N
An elevator carrying a person of mass m is moving upward and slowing down. How does the magnitude F of the force exerted on the person by the elevator floor compare with the magnitude mg of the gravitational force?
F < mg
F = mg
F > mg
F can be greater than or less than mg, depending on the speed of the elevator.
A ball is moved from Earth to a planet that has a gravitational acceleration that is double that of Earth. How does the gravitational force on the ball when it is on the new planet compare to the gravitational force on the ball when it is on Earth?
The gravitational force on the ball when it is on the new planet is double the force on the ball when it is on Earth.
The gravitational force on the ball when it is on the new planet is half the force on the ball when it is on Earth.
The gravitational force on the ball when it is on the new planet is the same as the force on the ball when it is on Earth.
The gravitational force on the ball when it is on the new planet is one-fourth the force on the ball when it is on Earth.
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, 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
An object slides across a horizontal surface such that it slows down due to the force of friction that is exerted on the object. The object and the direction of its displacement are shown in the figure. Which of the following free-body diagrams could represent the forces that are exerted on the object?
A 0.5 kg object is in free fall as it falls downward near the surface of a planet. A graph of the object’s velocity as a function of time is shown. What is the force due to gravity exerted on the object by the planet?
0.5 N
1.25 N
2.5 N
5 N
A block of mass 2 kg is suspended from a rope, as shown above. If the tension in the rope is 10 N, the acceleration of the block is most nearly
0 m/s2
2 m/s2 up
2 m/s2 down
5 m/s2 up
5 m/s2 down
