Physics Final

Which of the following has the largest momentum relative to the Earth?

( momentum = mass x velocity ) a pickup truck speeding down the highway

A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both move with a combined momentum of

1 unit

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts on the bat is

1000 N

A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the ball's mass?

16 kg

A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed?

3 m/s

A 10.0 N force is pulling up on the ring of spring scale that weighs 2.0 N. If an 8.0 N mass is attached to the bottom hook of the scale, the scale reading would be

8.0 N

The impulse-momentum relationship is a direct result of

Newton's 2nd law

When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. In this way the average force your body experience is

about 1/10 as great

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair - no wall, no tricks. You

agree that it can't be done

A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction force is the

force that the ball exerts on the bat

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction for is the

force the glove exerts on the ball

Padded dashboards in cars are safer in an accident than nonpadded ones because an occupant hitting the dash has

increased time of impact

Wherever there is an action force, there must be a reaction force which

is exactly equal in magnitude

Compared to falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the

stopping time is longer on the carpet

A Mack truck and a Volkswagen traveling at the same speed have a head-on-collision. The vehicle that undergoes the greatest change in velocity is

the Volkswagen

It is correct to say that impulse is equal to

the change in momentum

A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force impact is

the same for both

Suppose that a tiny gun made of a strong but very light material fires a bullet that is more massive than the gun itself. For such a weapon

the target would be safer than the shooter

In order to catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because the

time of the impact is increased

The difference between impulse and impact force involves the

time the force acts