Q1. a rifle recoils while firing a bullet. The speed of the rifle’s recoil is small because

A. rifle has much more mass than the bullet
B. force against the rifle is smaller than against the bullet
C. momentum of the rifle is smaller
D. momentum is mainly concentrated in the bullet

Q2. padded dashboards in cars are safer in an accident that non-padded ones because of occupant hitting the dash has

A. increased time of impact
B. decreased impulse
C. decreased time of impact
D. increased momentum

Q3. A 4 kg ball has momentum of 12kg m/s. what is ball’s speed?

A. 4m/s
B. 3 m/s
C. 12 m/s
D. 48 m/s
E. none of these

Q4. two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?

A. 0
B. half the sum of their original momentums
C. twice the sum of their original momentums
D. impossible to determine without additional information

Q5. an astronaut, floating alone in outer space, throws a baseball. If the ball floats away at a speed of 20 meters per second, the astronaut will

A. move in the opposite direction, but at a lower speed
B. move in the opposite direction at a speed of 20 m/s
C. move in the opposite direction but at a higher speed
D. not move as stated in any of a the above choices