momentum

if mass is constant, double velocity, double momentum it would a what kind of relationship

directly proportional

total momentum of a system

doesn't change

change in momentum

impulse

force x time

impulse

if momentum is constant, double mass, cut velocity in half, it would be a what kind of relationship

inversely proportional

In the absence of a net external force, the momentum of an object or system of objects is unchanged

law of conservation of momentum

mass x velocity

momentum

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 upon impact. Doing this reduces the force of impact on the player's hand principally because the (a) force of impact is increased (b) relative velocity is less (c) time of impact is increased (d) time of impact is decreased (e) none of these

C

Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a greater (a) speed (b) acceleration (c) momentum (d) all of these (e) none of these

C

You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum? (a) the bug= change in velocity (b) your car (c) both the same = change in momentum is ALWAYS the same

C

Suppose a gun were made of a strong but very light material. Suppose also that the bullet is more massive than the gun itself. For such a weapon (a) the target would be safer than the shooter (b) recoil problems would be lessened (c) conservation of energy would not hold (d) conservation of momentum would not hold (e) both conservation of energy and momentum would not hold

D

When you are in the way of a fast moving object and can't get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a (a) long time (b) short time (c) same way either way

A

A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is (a) zero (b) doubled (c) quadrupled (d) unchanged P=mv, doubles mass= doubles momentum as LONG AS v stays still

B

Compared to falling on a wooden floor, a wineglass may not break when it falls to a carpeted floor because of the (a) lesser impulse in stopping (b) longer time to stop (c) both of these (d) neither

B

The difference between impulse and impact force involves the (a) distance the force acts (b) time the force acts (c) difference between acceleration and velocity (d) mass and its effect on resisting a change in momentum

B

Which of the following has the largest momentum relative to the earth? (a) a tightrope walker crossing Niagara Falls (b) a pickup truck speeding along a highway (c) a Mack truck parked in a parking lot= NO MOTION (d) the Science building on campus (e) a dog running down the street

B

A cannonball shot from a cannon with a long barrel will have a greater muzzle velocity because the cannonball receives a greater (a) force (b) impulse (c) both of these (d) neither of these

C

A martial arts master attempts to break a brick with his bare hand. In which of the situations below is the impact force on his hand the greatest? Assume he swings his hand with the same velocity in each attempt and that the time of impact is the same as well. (a) Hand passes through the brick (b) His hand comes to an immediate halt. (c) His had bounces back with nearly the velocity it had in the opposite direction. (d) All of the above will result in the same impact fore.

C

A moving object on which no forces are acting will continue to move with constant (a) acceleration you can't move constantly with no force (b) impulse= not any change in momentum (c) momentum= constant velocity (d) all of these (e) none of these

C

A rifle recoils from firing a bullet. The speed of the rifle's recoil is small because the (a) force against the rifle is smaller than against the bullet (b) momentum is mainly concentrated in the bullet MOMENTUM can't be concentrated (c) rifle has much more mass than the bullet (d) momentum of the rifle is smaller

C

A bullet is fired from a gun. The speed of the bullet will be about the same as the speed of the recoiling gun (a) because momentum is conserved (b) because velocity is conserved (c) because both velocity and momentum are conserved (d) if the mass of the bullet equals the mass of the gun= same velocity (e) none of these

D

It is correct to say that impulse is equal to (a) momentum (b) the change in momentum (c) the force multiplied by the distance the force acts (d) all of these (e) none of these

D

Inertia of motion

momentum