Physics AP Questions & Answers

Physics AP Questions & Answers A ball is dropped onto the floor and bounces upward. Which of the following claims are correct about the force that the ball exerts on the floor compared to the force that the floor exerts on the ball when the ball and the floor are in contact? - CORRECT ANSWER- The magnitude of the forces exerted by both objects is the same because the ball and the floor cannot exert forces of different magnitudes on each other. A ball is released from rest from the twentieth floor of a building. After 1 s, the ball has fallen one floor such that it is directly outside the nineteenth-floor window. The floors are evenly spaced. Assume air resistance is negligible. What is the number of floors the ball would fall in 3s after it is released from the twentieth floor? - CORRECT ANSWER- 7 to 10 floors A ball traveling at a speed ν0 rolls off a desk and lands at a horizontal distance x0 away from the desk, as shown in the figure. The ball is then rolled off of the same desk at a speed of 3 v0. At what horizontal distance will the ball land from the table? - CORRECT ANSWER- 3x0 A bowling pin is thrown vertically upward such that it rotates as it moves through the air, as shown in the figure. Initially, the center of mass of the bowling pin is moving upward with a speed vi of 10 m/s. The maximum height of the center of mass of the bowling pin is most nearly - CORRECT ANSWER- vi^2/2g A car initially at rest accelerates at 10m/s^2. The car's speed after it has traveled 25 meters is most nearly - CORRECT ANSWER- 22.0 m/s A cart with an unknown mass is at rest on one side of a track. A student must find the mass of the cart by using Newton's second law. The student attaches a force probe to the cart and pulls it while keeping the force constant. A motion detector rests on the opposite end of the track to record the acceleration of the cart as it is pulled. The student uses the measured force and acceleration values and determines that the cart's mass is 0.4kg. When placed on a balance, the cart's mass is found to be 0.5kg. Which of the following could explain the difference in mass? - CORRECT ANSWER- The track was not level and was tilted slightly downward. A ladybug is crawling up a wall at constant speed, as shown above. Which of the following are correct justifications for how forces help the ladybug move up the wall? Select two answers. - CORRECT ANSWER- The ladybug exerts a downward force on the wall to move itself up the wall.