Exam 3

Question 1

Momentum

Answer 1

P=mv
Momentum is mass times velocity.
It is a vector.

Question 2

If you go twice as fast, how does this change your momentum?
How does it change your Velocity?

Answer 2

P=m2v so doubles your momentum

KE=1/2 m(2v)^2
so your KE increases by factor of 4

Question 3

Impulse

Answer 3

Change in momentum:
Pf-Pi same as mvf-mvi

Question 4

How dose bouncing affect impulse?

Answer 4

A bounce will double the impulse.
No bounce: Bounce:
Final V is 0 Final V =Initial V
Impulse = mvf-mvi
0-mvi = mvi -mvf-mvi= -2mv

So object that bounce will have more force

Question 5

Conservation of momentum is calculated…

Answer 5

Conservation of momentum is calculated in each dimension. x axis and y axis.
conservation means equals zero

Question 6

Elastic Collisions

Answer 6

Bounce/ no sticking, no deformation

momentum is conserved AND
KE is conserved, meaning KEf=KEi

Elastic collisions have the cheater equations she will provide

Question 7

Inelastic Collisions

Answer 7

stick together, can have deformation,
thermal or sound energy lost

Momentum is conserved but KE is not!
When two objects stick together, their final momentum is equal (velocity is the same)