forces - change in momentum

Question 1

______ changes in velocity are _________ _________

Answer 1

rapid, extremely dangerous

Question 2

why are crash tests used by car manufacturers?

Answer 2

to design safety features such as seat belts

Question 3

what happens to a person/people during a car crash?

Answer 3

the momentum of passengers falls from a large amount to zero in less than a second. this places huge forces on passengers which can be lethal

Question 4

acceleration equation (m/s squared)

Answer 4

change in velocity (m/s) / time (s)

Question 5

force equation using acceleration equation (don’t need to learn)

Answer 5

force (N) = mass (kg) x change in velocity (m/s) / change in time (s)

the ‘ mass x change in velocity ‘ is the change in momentum

Question 6

the_____ acting on a person can be _____

Answer 6

force , fatal

Question 7

how can we reduce danger of rapid changes in momentum?

Answer 7

if we make change in momentum happen over a longer time

Question 8

what are the 5 safety devices that can slow down momentum change

Answer 8

airbags, seatbelts, crash at, bike helmet, cushioned surface

Question 9

how do safety devices slow down momentum change?

Answer 9

reduces force acting and reduces the risk of serious injury