Free Printable AP Physics C Unit 3 Questions

1.

Two ghosts, A and B, of mass m and 2m respectively, are carried to height h at constant velocity, but B rises twice as fast as A. The work the gravitational force does on B is

a)

four times the work done on A.

b)

one half the work done on A.

c)

the same as the work done on A.

d)

twice the work done on A.

2.

A ghost of mass M tied to the end of a pendulum string swings from A to B as shown. Which of the following statements is true?

a)

The potential energy of the ghost is conserved as it falls.

b)

The sum of the kinetic and potential energies is a constant.

c)

The difference between kinetic energy and potential is a constant.

d)

The total energy of the ghost increases as it falls since it gains speed.

3.

Three identical pumpkins are thrown from the same height above the ground. Pumpkins X is thrown vertically up, Y is thrown horizontally, and Z is thrown vertically down, as shown in figures 1, 2, and 3, respectively. All three pumpkins are thrown with the same speed. Assume the pumpkins collide elastically with the ground and rebound. Rank the spheres based on the rebound height after they collide with the ground.

a)

X > Y > Z

b)

Y > (X = Z)

c)

(X = Z) > Y

d)

(X = Y) > Z

4.

The position of a ghost with respect to time is given by the function below. At what time shown below is the instantaneous work being done on the ghost positive?

x\left(t\right)=-2t^2+8t-1

a)

t = 3 s

b)

t = 2 s

c)

t = 1 s

d)

The work is never positive

5.

Ghosts A and B have equal masses and travel equal distances D on side-by-side straight frictionless tracks while a constant force F acts on A and a constant force 2F acts on B. Both ghosts start from rest. The velocities vA and vB of the ghosts at the end of distance D are related by:

a)

$v_B=v_A$

b)

$v_B=\sqrt{2}v_A$

c)

$v_B=2v_A$

d)

$v_B=4v_A$

6.

A 10-kg ghost is constrained to move along the x-axis. The potential energy U of the ghost is given as a function of its position by the function below. Calculate the force on the ghost at x = 3 m.

U\left(x\right)=6x^2-4x+3

a)

32 N

b)

-45 N

c)

45 N

d)

-32 N

7.

A ghost of mass M is being raised to the tenth floor of the Tower of Terror, which has a height of 4y. During the first part of the lift, the crane lifts the ghost a vertical distance of 3y in time 4T. During the second part of the lift, the crane lifts the ghost a vertical distance of y in time T. Which of the following correctly relates the power generated by the crane during the first part of the lift to the power generated during the second part of the lift?

a)

$P_2=4P_1$

b)

$P_2=\frac{3}{4}P_1$

c)

$P_2=\frac{1}{3}P_1$

d)

$P_2=\frac{4}{3}P_1$

8.

A pumpkin of mass on a frictionless incline (30 degrees) is connected to an ideal spring with elastic constant k. The pumpkin is released from rest when the spring is unstretched. Derive an expression for the speed of the pumpkin when the spring is stretched a distance of D from equilibrium.

a)

$\sqrt{gD+\frac{kD^2}{M}}$

b)

$\sqrt{\frac{kD^2}{M}-gD}$

c)

$\sqrt{2gD-\frac{kD^2}{M}}$

d)

$\sqrt{gD-\frac{kD^2}{M}}$

9.

The system shown consists of two objects of unequal masses, M₁ and M₂, and pulley with negligible mass and friction. Which of the following is true about the changes in the gravitational potential energy and kinetic energy of the system soon after the objects are released from rest?

a)

$\Delta U\ <\ 0\ and\ \Delta K\ >0$

b)

$\Delta U=0\ and\ \Delta K>0$

c)

$\Delta U>0\ and\ \Delta K<0$

d)

$\Delta U<0\ and\ \Delta K=0$

10.

The potential energy for a particle, U, as a function of distance from the origin is given by the graph shown. If the particle is released from rest at position r0, what is its speed at position 2ro?

a)

$\sqrt{\frac{8U_0}{m}}$

b)

$\sqrt{\frac{4U_0}{m}}$

c)

$\sqrt{\frac{6U_0}{m}}$

d)

$\sqrt{\frac{2U_0}{m}}$

AP Physics C Unit 3 Questions

Total questions: 10

Worksheet time: 14mins

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