Momentum

Question 1

What type of quantity is momentum?

Answer 1

• vector quantity

Question 2

What is the unit for momentum?

Answer 2

kg m/s

Question 3

What is the law of conservation of momentum?

Answer 3

• in closed system total momentum before event = total momentum after event
• no energy & forces entering or leaving system

Question 4

How could changes in momentum be dangerous?

Answer 4

• decelerate over short time = big force on body

Question 5

How do airbags help decrease the force of a rapid deceleration?

Answer 5

• increases time taken for change in momentum
• reduces force + risk of injury