AP Physics 1 Midterm Review Questions and Verified Answers (2023/ 2024)

AP Physics 1 Midterm Review Questions and Verified Answers (2023/ 2024) Q: A steel ball supported by a stick rotates in a circle of radius r, as shown above. The direction of the net force acting on the ball when it is in the position shown is indicated by which of the following? (see picture) a. up b. down c. left d. up diagonal e. right Answer: e. right Q: A compressed spring mounted on a disk can project a small ball. When the disk is not rotating, as shown in the top view above, the ball moves radially outward. The disk then rotates in a counterclockwise direction as seen from above, and the ball is projected outward at the instant the disk is in the position shown above. Which of the following best shows the subsequent path of the ball relative to the ground? (see picture) a. right, down b. right, up c. right d. right diagonal down e. right diagonal up Answer: e. right diagonal up Q: What is the kinetic energy of a satellite of mass m in that orbits the Earth, of mass M in a circular orbit of radius R? a. Zero b. (1/2)(GMm/R) c. (1/4)(GMm/R) d. (1/2)(GMm/R^2) e. GMm/R^2 Answer: b. (1/2)(GMm/R) Q: Two skates are initially at rest next to each other on frictionless ice. Skater A pushes on skater B. If skater A has greater mass than skater B, which of the following correctly relates the magnitudes of their momentums p and their kinetic energies K after the push? a. pA = pB and KA < KB b. pA = pB and KA = KB c. pA = pB and KA > KB d. pA < pB and KA < KB e. pA < pB and KA = KB Answer: a. pA = pB and KA < KB Q: An object of mass m is initially at rest and free to move without friction in any direction in the xy-plane. A constant net force of magnitude F directed in the +x direction acts on the object for 1 s. Immediately thereafter a constant net force of the same magnitude F directed in the +y direction acts on the object for 1 s. After this, no forces act on the object. 27. Which of the following vectors could represent the velocity of the object at the end of 3 s, assuming the scales on the x and y axes are equal? (see pictures) a. right b. right diagonal c. right diagonal steeper d. right diagonal steepest e. straight up Answer: c. right diagonal steeper Q: An object has a weight W when it is on the surface of a planet of radius R. What will be the gravitational force on the object after it has been moved to a distance of 4R from the center of the planet? a. 16 W b. 4 W c. W d. ¼ W e. 1/16 W Answer: e. 1/16 W Q: Balls 1 and 2 are each thrown horizontally from the same height above level ground, but ball 2 has a greater initial velocity after leaving the thrower's hand. If air resistance is negligible, how do the accelerations of the balls and the times it takes them to hit the ground compare? A. Acceleration a- greater for ball 2; time to hit ground- greater for ball 2 B. Acceleration a- greater for ball 2; time to hit ground- equal C. Acceleration a- equal; time to hit ground- greater for ball 2 D. Acceleration a- equal; time to hit ground- less foe ball 2 E. Acceleration a- equal; time to hit ground- equal Answer: E. Q: A block is projected up a frictionless plane with an initial speed v0. The plane is inclined 30° above the horizontal. What is the approximate acceleration of the block at the instant that it reaches its highest point on the inclined plane? A. zero B. 5 m/s2 down the incline C. 10 m/s2 down the incline D. 10 m/s2 up the incline E. It cannot be calculated without knowing the value of v0 Answer: B. Q: Two objects, X and Y, accelerate from rest with the same constant acceleration. Object X accelerates for twice the time as object Y. Which of the following is true of these objects at the end of their respective periods of acceleration? a. Object X is moving at the same speed as object Y. b. Object X is moving four times faster than object Y c. Object X has traveled the same distance as object Y d. Object X has traveled twice as far as object Y e. Object X has traveled four times as far as object Y