Physics HW5

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of

1 kg m/s

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

Which of the following has the largest momentum relative to the Earth's surface?

A pickup truck speeding along the highway

A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, it's momentum is

Doubled

The force that accelerates a rocket in outer space is exerted on the rocket by the

Exhaust gases

A bullet is fired from a gun. The speed of the bullet will be about the same as the speed of the recoiling gun

If the mass of the bullet equals the mass of the gun

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

Increased time of impact

A car traveling along the highway needs a certain amount of force exerted on it to stop it in a certain distance. More stopping force is required when the car has

More mass. More momentum. Less stopping distance.

The impulse-momentum relationship is a direct result of

Newton's 2nd law

The conservation of momentum is most closely related to

Newton's 3rd law

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

Rifle has much more mass than the bullet

The force on an apple hitting the ground depends upon

The speed of the apple just before it hits. The time of impact with the ground.

Suppose that a tiny gun made of 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