linear momentum - lesson 2&3

Question 1

what is the conservation of linear momentum?

Answer 1

states that the total momentum of two objects before a collision remains the same as the total momentum after the collision

Question 2

define impulse

Answer 2

application of force on an object over a period of time

impulse = force x time

Question 3

describe the impulse-momentum relationship

Answer 3

impulse applied to an object equals the change in momentum that the object will experience

Question 4

when does conservation of linear momentum take place?

Answer 4

when a perfectly elastic collision takes place

- one where no energy is lost to sound, heat, or the change of shape of the colliding objects

Question 5

in what ways can Impulse can be applied?

Answer 5

1) creates momentum e.g. increases the momentum of an object from zero e.g. shot put
2) Changing momentum e.g. increasing/decreasing momentum of a moving object e.g. drop shot in tennis
3) Stopping momentum e.g. taking momentum back to zero e.g. landing after a high jump attempt

Question 6

how is impulse used in sport?

Answer 6

• important in impact / collision situations
• want to manipulate the momentum of one of the colliding objects to produce the desired outcome
• Tennis racquets have different tension strings depending on the user’s individual requirements;
  Looser strings – ball on racquet for longer
  – more power, less control
  Tighter strings – ball on racquet less time
  – more control, less power

Question 7

how do we decrease momentum?

Answer 7

by increasing the time component so we can reduce the peak force and reduce injury

Question 8

how can we increase momentum

Answer 8

maximize both force + time