forces - impulse (whatyouneed2know)

Question 1

impulse equation

Answer 1

impulse = mv - mu = force x time

Question 2

what is impulse?

Answer 2

the change in momentum

Question 3

how do you cause a ball to change direction (force, time)

Answer 3

the wall must provide a FORCE to the ball the whole TIME the ball + wall are in contact

Question 4

how do you find impulse?

Answer 4

change in momentum can be found by multiplying the FORCE applied by the TIME it is applied

Question 5

measurement labels for:
- change in momentum
- force
- time
- impulse

Answer 5

change in momentum - kg m/s

force - N

time - s

impulse - Ns

Question 6

since the mass is constant..

(time taken, amount of force etc..)

Answer 6

..increasing the time taken will decrease the amount of force needed to stop the motion

Question 7

linking to impulse, to stop a car from moving..

Answer 7

an impulse is provided by the barrier

Question 8

shorter collision time means?

Answer 8

a greater force

Question 9

longer collision time means?

Answer 9

a lesser force

Question 10

active safety features that reduce injuries during collision?

Answer 10

• increasing impact time
• decreasing the rate of momentum
  (however change in momentum will always remain the same)
• decrease the acceleration
• decrease force and reduce severity of injuries