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Practice Test 11 - AP Physics 1

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

  1. 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?
  2. Object EE has mass $4m$ and speed vv. Object FF has mass mm and speed 4v4v, both moving east. Which statement about momentum magnitudes is correct?
  3. A 0.50 kg cart rests on a frictionless track. Taking Ug=0U_g=0 at point RR, the cart is at point PP that is 2.0 m above RR. Which statement about gravitational potential energy is correct?
  4. A soccer ball is kicked so it initially moves northeast; gravity acts downward. Neglecting air resistance, which component of acceleration is nonzero during flight?
  5. A 2.0 kg crate is pulled across the floor at constant speed by a rope with tension 40 N. Considering only the interaction between the rope and the crate, which comparison is correct?
  6. In 1D motion, object GG has momentum pG=−5 kg⋅m/sp_G=-5\,\text{kg}\cdot\text{m/s}. Which statement must be true about its velocity direction?
  7. An object floats at rest in a tank. It is moved to a larger tank of the same fluid and still floats at rest. What changes?
  8. A bus moves right at 10 m/s10\ \text{m/s} relative to the ground. A student inside the bus walks right at 1 m/s1\ \text{m/s} relative to the bus. What is the student's velocity relative to the ground?
  9. A cart attached to a spring executes SHM on a level track with negligible friction. At equilibrium, the cart's kinetic energy is 10 J10\,\text{J} while the spring potential energy is 0 J0\,\text{J}. At the instant the cart is at a turning point, its speed is zero. What is the spring potential energy at that turning point?
  10. A meterstick is pivoted at its left end on a frictionless pin. A force FF is applied at the 1.0 m mark straight upward; its line of action is vertical. The lever arm equals the full 1.0 m. If the same FF is instead applied straight upward at the 0.50 m mark, how does the torque magnitude about the pivot change?
  11. A cube is fully submerged and released from rest. At release, only buoyant force upward and weight mgmg downward act. The cube remains at rest (does not start moving). What can be inferred?
  12. A uniform disk initially at rest experiences a constant torque of 0.60 N⋅m0.60\ \text{N}\cdot\text{m} for 2.0 s2.0\ \text{s}. What is the magnitude of the disk's change in angular momentum?
  13. A rigid turntable rotates about a vertical central axis. Without changing its shape, it is set spinning at a larger angular speed than before. Which change must occur to its rotational kinetic energy?
  14. A moon is in circular orbit. At point F1, its velocity is tangent west. Which is the best reason the moon does not move in a straight line?
  15. A disk starts from rest and reaches ω=10 rad/s\omega=10\ \text{rad/s} after 5 s5\ \text{s} with constant α\alpha. What is α\alpha?
  16. A book rests on a shelf 2.0 m2.0\,\text{m} above the floor, where Ug=0U_g=0. What is the sign of the book's gravitational potential energy?
  17. A puck moves on a straight line where east is positive and west is negative. Its displacement during an interval is 0 m0\,\text{m}. Which must be true?
  18. A ball and Earth interact gravitationally as the ball falls straight down. Define the system as ball + Earth; the gravitational forces between them are internal, and ignore air resistance and other external forces. What happens to the center-of-mass motion of this system?
  19. A box is held at rest against a vertical wall by a person pushing horizontally on it. Static friction between the wall and box acts vertically, and gravity acts downward. The box remains motionless. Which statement must be true about the vertical forces on the box?
  20. An elevator moves upward at 2 m/s2\ \text{m/s} relative to the building. A loose bolt falls downward at 1 m/s1\ \text{m/s} relative to the elevator. In the elevator frame the bolt is 1 m/s1\ \text{m/s} downward; in the building frame velocities add with sign. What is the bolt's velocity relative to the building?

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