Momentum (Test # 3)

Momentum

Mass in motion

Any object that is moving

has momentum

When the object is moving: if mass increases,

momentum will also increase

Why is momentum a vector?

Because it has magnitude and direction

If there is a big stationary object and a small object that is moving, which object has the biggest momentum?

a. Big object b. Equal

c. Neither d. Small object

D! Why? Object has to be in motion in order for it to have momentum!

What force needs to be present with momentum?

An external force

If A and B are only interacting with each other, the rate of change of momentum for object A should have what relationship to object B?

ROC for A must be equal to or opposite to B

∆p(i) ∆p(f)

------- = -------

∆t ∆t

Conservation of Momentum

p = mv

momentum = mass x velocity

∆p

----

∆t

change in momentum = change in momentum/change in momentum