Momentum Study GuideMomentum Study Guide

What equation is used to directly calculate

momentum?

p = mv

There are two moving 10 kg objects.

Object 1 has velocity of 5m/s Object 2 has velocity of 2.5m/s

Which has the greater momentum?

Object 1

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A roller coaster works by putting in an initial energy to get the cart

to the top. When does the cart have the

greatest momentum?

A roller coaster works by putting in an initial energy to get the cart

to the top. When does the cart have the

greatest momentum?

At the bottomAt the bottom

I bounce a rubber ball off of the floor and it returns to my hand with the same velocity. How would you describe the magnitude of the ball’s momentum?

Stayed the Same

Watch the following experiment.

Teacher stands up from chair

Describe the momentum of the chair.

Pi = 0 Pf > 0

If the time that a force is exerted on an object is large then the momentum will

be?

Large

If the force is exerted on an object is small, but is exerted for a long time then

the momentum will be?

Large

A ball with a momentum of 6.0 kg·m/s hits a wall and bounces straight back without

losing any kinetic energy. What is the change in the ball’s momentum?

Δp = pf -pi

Δp = -6.0 –(6.0) = -12.0kg*m/s

A 0.25 kg baseball is pitched with a velocity of 50 m/s and is

then batted to the pitcher with a velocity of 70 m/s. What is the

magnitude of change in the ball’s momentum?

Δp = mΔv

Δp = m(vf-vi)

MomentumThe impulse experienced by a

body is equivalent to the body’s change in

I = Δp

A player at first base catches a throw traveling 22 m/s. The baseball, which has a mass of 0.21 kg, comes to a complete stop in the glove after 0.15 s. Assuming the force of the glove was uniform, what force did the glove exert on the ball?

Ft =mv => F = mv/t

I =mv

What if it asked for impulse?

Newton’s Second Law is commonly expressed as

F = maHowever, Newton

originally expressed it as

Ft = mvProve mathematically

that both expression are one in the same.

Newton’s Second Law is commonly expressed as

F = maHowever, Newton

originally expressed it as

Ft = mvProve mathematically

that both expression are one in the same.

The End!The End!The End!The End!The End!The End!