Question

a. Two ice skaters are standing at the center of a frictionless pond. Skater 2 has twice the mass of skater 1. Skater 2 pushes on skater 1. Which of the following is true? i. Skater 1 and skater 2 both have the same speed after the push. ii. Skater 1 has twice as much momentum as skater 2 after the push iii. The total momentum of the 2 skaters after the push is zero iv. None of the above.

b. A pendulum swings back and forth. Ignoring friction and air resistance, the total mechanical energy of the pendulum is i. greatest when the pendulum is at its lowest point ii. greatest when the pendulum is at its highest points iii. the same at all points iv. None of the above.

c. Two blocks of equal mass are sliding along a horizontal surface. One hits a wall and stops. The other slows to a stop gradually due to friction. Which of the following is/are true? i. There is a larger force applied to the block that hits the wall ii. There is a larger impulse applied to the block that hits the wall iii. The block that hits the wall pushes on the wall with less force than the wall pushes on the block iv. Both i and ii v. Both i and iii vi. Both ii and iii

Answer 1