Unit 8

Question 1

What is the definition of momentum? What factors affect the momentum of an object?

Answer 1

• the product of mass and velocity

- mass and velocity

Question 2

How could a moving bicyclist and a moving bus have the same momentum?

Answer 2

• the bicyclist is going fast but has a small mass

- the bus is going slow but has a big mass

Question 3

Define impulse - explain how this relates to the momentum of an object

Answer 3

• the product of force and time

- the change in momentum equals the impulse (delta)p =J

Question 4

Why does a baseball catcher move his hand backwards as he catches a pitch?

Answer 4

-to increase the time it takes for the ball to completely stop so the force is smaller

Question 5

Why is a follow-through important?

Answer 5

-it increases the time it takes for the ball to get out of you stick/foot so the force is bigger

Question 6

Is it possible for an object to obtain a larger impulse from a smaller force than it does from a larger force? If so, how?

Answer 6

• yes

- if the amount of time it is much greater in the smaller force then the larger force then the impulse will be bigger

Question 7

If the impulse applied to an object remains constant and the force exerted increases, what happens to the time during which the force is applied?

Answer 7

It goes down