Practice Test 2 - 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 moon is in a circular orbit around a planet. At point R1, its velocity is tangent east. Which statement about the moon's motion is correct at that instant?
2. A bicycle wheel rotates about its axle. The wheel's angular speed is reduced while its mass distribution remains the same. Which statement about its rotational kinetic energy is correct?​
3. A box is on a rough horizontal surface. A horizontal force $F$ pulls it to the right. The box is at rest but is about to start moving to the right. The friction force is static; other forces are weight and normal. What is the magnitude of the friction force at this instant?
4. During a drill, a 70 kg student wearing sneakers pushes horizontally on a rigid wall for 5 s without slipping. The wall does not move, and the student remains at rest. Consider the interaction between the student's hands and the wall. Which statement correctly compares the forces in this interaction?
5. A 0.50 kg drone hovers at a constant altitude with zero vertical velocity. The drone's rotors push air downward; Earth pulls downward. Which is true about the net force on the drone?
6. A boat moves east across a lake at constant velocity. The engine provides a steady thrust east, while water drag acts west. Vertical forces from buoyancy and weight also act. The boat's speed and direction remain unchanged. Which statement best describes the net force on the boat?
7. A mass–spring oscillator has mass $m$ and spring constant $k$. If the amplitude is increased from $A$ to $2A$ (still SHM), the frequency
8. A small object in a fluid experiences only two vertical forces: buoyant force upward and weight $mg$ downward. It is observed to move downward while speeding up. What is the net force direction?
9. A $50\,\text{N}$ block rests on a table. Pressure is due to contact force. If it lies on a $0.010\,\text{m}^2$ face or a $0.005\,\text{m}^2$ face, which pressure is greater?
10. A robot's position–time graph has time $t$ on the horizontal axis and position $x$ on the vertical axis. The graph decreases and is concave up. Which statement is supported?
11. A pendulum bob of mass $m$ is released from rest at point $A$ and swings to the lowest point $B$. Air resistance is negligible. The vertical drop from $A$ to $B$ is $\Delta y$. A student sets the gravitational potential energy to zero at point $A$ instead of at $B$. What is the correct expression for the bob's kinetic energy at $B$?
12. A moving cart collides with a stationary cart and they lock together; afterwards the combined cart moves right. Which conclusion is correct?
13. Two pucks move along the same line: puck 1 has mass $m$ and speed $v$, puck 2 has mass $2m$ and speed $\tfrac{v}{3}$, both to the right. Which has greater momentum magnitude?
14. A spring has $U_s=0$ at $x=0$. It is compressed to $x=-0.12\ \text{m}$. Compared with $U_s$ at $x=0$, the spring potential energy is
15. Two cars travel on a straight road: car $A$ has mass $m$ and speed $4v$, car $B$ has mass $4m$ and speed $2v$. Which has greater kinetic energy?
16. A drone moves west at $8\ \text{m/s}$ relative to the ground. A package is released with zero velocity relative to the drone at the instant of release. In the drone frame the package is momentarily at rest; in the ground frame it shares the drone's velocity at that instant. What is the package's horizontal velocity at release in the ground frame?
17. A $1.5\,\text{kg}$ block is held at rest against a vertical rough wall by a horizontal push of $20\,\text{N}$ into the wall. The friction is static; other forces are weight and the wall's normal force. What is the direction of the friction force on the block?
18. A rigid carousel rotates counterclockwise with constant angular speed $\omega$. Two riders stand on the platform at distances $r_1$ and $r_2$ from the center, with $r_2>r_1$. Assume both riders rotate with the platform without slipping. Which statement about their linear speeds is correct?
19. A skater of mass $m$ glides at speed $v$ on level ice. Another skater of mass $2m$ glides at the same speed $v$. Neglect friction. Which statement about their kinetic energies is correct?
20. Two carts move on a level track. Cart $A$ has mass $m$ and speed $v$. Cart $B$ has mass $m$ and speed $2v$. Which cart has the greater kinetic energy?

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