Practice Test 12 - AP Physics 1

20 questions. Answer them in any order, then submit to see your score and every explanation.

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1. A rubber ball rolls and collides with an identical ball at rest; they rebound with little sound. Which is the best description of conservation laws?
2. A 0.20 kg rubber stopper is tied to a string and swung in a horizontal circle of radius 0.60 m at constant speed 3.0 m/s. Ignore air resistance. At the instant the stopper is at the rightmost point of the circle, what is the direction of the stopper's acceleration?
3. Two identical carts on a frictionless track interact via a compressed spring. Initially, both carts are at rest and the spring is compressed between them; the system is the two carts (ignore the spring's mass). External forces on the system are negligible. After release, cart 1 moves left at $3.0\,\text{m/s}$. What is the velocity of cart 2?
4. A uniform cube $Q$ and a uniform cube $R$ have equal mass. Cube $Q$ has greater side length. Which statement is correct?
5. A $8.0\,\text{kg}$ crate in the lab frame is pushed right with $28\,\text{N}$. Kinetic friction is $12\,\text{N}$ left; weight and normal cancel. The crate accelerates right. What is the net force magnitude on the crate?
6. A block is attached to a horizontal spring and held at the relaxed length $x=0$, where $U_s=0$. It is moved to $x=+0.05\,\text{m}$. Which is correct?
7. A mass $m$ oscillates on a spring with constant $k$ and period $T$. If both $m$ and $k$ are doubled, what happens to the period?
8. Two identical containers are filled to the brim, one with liquid $A$ and one with liquid $B$. The container with liquid $B$ has less mass. Which is correct?
9. A position–time graph for SHM labels equilibrium at $x=0$. At $t=1.0\,\text{s}$ the graph crosses $x=0$ with a positive slope (moving +x). What is the sign of the velocity at $t=1.0\,\text{s}$?
10. Two blocks with masses $m$ and $9m$ oscillate on identical springs of constant $k$ with small amplitude. Compared to the $m$ block, the $9m$ block's period is
11. A pendulum bob is displaced so that $\theta$ reaches $30^ irc$. The tangential restoring acceleration is $a_t=-g\,\sin\theta$. Is the motion simple harmonic?
12. A cart of mass $m$ moves with speed $v$ on a straight track. Its speed increases to $2v$ while its mass stays constant. How does its kinetic energy change?
13. A wheel of radius $R$ rolls without slipping with angular speed $\omega$. What is the speed of its center of mass?
14. A solid cylinder rotates about its central axis. A constant net torque is applied clockwise, and the angular acceleration is clockwise. The cylinder is replaced by a different object that has smaller rotational inertia about the same axis, while the net torque is unchanged. What happens to $\alpha$?
15. A simple pendulum of length $L$ oscillates with small amplitude. If the length is changed to $4L$, the new period is
16. A simple pendulum of length $L$ swings with small angle amplitude. If the bob's mass is increased, how does the period change?​
17. A sign is suspended by two cables from a ceiling and remains motionless. Taking torques about the sign's center, the angular acceleration is $\alpha=0$. What can be concluded about net torque?
18. A uniform disk rotates about its central axis. It is replaced by a different object that has the same mass and angular speed $\omega$ but a larger moment of inertia about the same axis. The rotational kinetic energy of the new object is​
19. A disk rotates about a fixed axle through its center. A tangential force at the rim produces a clockwise torque while the disk rotates counterclockwise through an angle $\theta$. What is the work done by that torque?
20. Two identical boxes are pulled across a rough floor at constant speeds. Box 1 moves at speed $v$ under pull force $F$; Box 2 moves at speed $2v$ under the same pull force $F$. Which has greater power?

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