PHYS Group Quiz 3

The impulse-momentum relationship is a direct result of A. Newton's 2nd law. B. Newton's 1st law. C. Newton's law of gravity. D. Newton's 3rd law.

A. Newton's 2nd law.

Two identical golf carts move at different speeds. The faster cart has twice the speed and therefore has A. four times the kinetic energy. B. twice the kinetic energy. C. eight times the kinetic energy. D. none of the above

A. four times the kinetic energy.

Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the A. stopping time is longer on the carpet. B. carpet provides a smaller impulse and a longer time. C. stopping time is shorter on the carpet. D. carpeted floor provides a smaller impulse.

A. stopping time is longer on the carpet.

You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact? A. the bug B. your car C. both the same

C. both the same

The work you do when pushing a shopping cart twice as far while applying twice the force is A. half as much. B. twice as much. C. four times as much. D. the same amount.

C. four times as much.

The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is A. 4 kg. B. 12 kg. C. 144 kg. D. 16 kg. E. none of these

D. 16 kg.

A 2-kg box of taffy candy has 40 J of potential energy relative to the ground. Its height above the ground is A. 4 m. B. 1 m. C. 3 m. D. 2 m. E. none of the above

D. 2 m.

A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is A. more than 80 J. B. 6 J. C. 8 J. D. 80 J. E. 32 J.

D. 80 J.

A bicycle that travels twice as fast as another when braking to a stop will skid A. depends on the bike's mass B. twice as far. C. sixteen times as far. D. four times as far. E. eight times as far

D. four times as far.

The work done in pushing a TV set a distance of 2 m with an average force of 20 N is A. 20 J. B. 40 J. C. 800 J. D. 2 J. E. 10 J.

B. 40 J.

Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of A. 500 J. B. 5000 J. C. 510 J. D. more than 5000 J. E. 10 J.

B. 5000 J.

A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car? A. 5 m/s B. 6 m/s C. 4 m/s D. 8 m/s E. none of the above

B. 6 m/s

The conservation of momentum is most closely related to A. Newton's law of gravity B. Newton's 3rd law. C. Newton's 2nd law. D. Newton's 1st law.

B. Newton's 3rd law.

A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater A. acceleration. B. momentum. C. speed. D. all of the above E. none of the above

B. momentum.

No work is done by gravity on a bowling ball that rolls along a bowling alley because A. the ball's speed remains constant. B. the force on the ball is at right angles to the ball's motion. C. no force acts on the ball. D. little distance is covered by the ball.

B. the force on the ball is at right angles to the ball's motion.

The work you do when pushing a shopping cart a given distance while applying twice as much force is A. half as much. B. twice as much. C. four times as much. D. the same amount.

B. twice as much.

The work you do when pushing a shopping cart twice as far while applying the same force is A. half as much. B. twice as much. C. four times as much. D. the same amount.

B. twice as much.

The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is A. 3000 N. B. 4000 N. C. 2000 N. D. 5000 N. E. 1000 N.

C. 2000 N.

The speed of a 4-kg ball with a momentum of 12 kg m/s is A. 4 m/s. B. 48 m/s. C. 3 m/s. D. 12 m/s. E. none of the above

C. 3 m/s.

It is correct to say that impulse is equal to A. force multiplied by the distance it acts. B. momentum. C. a corresponding change in momentum. D. velocity multiplied by time.

C. a corresponding change in momentum.