P3: Momentum and Force

Question 1

Momentum=

Answer 1

Mass (kg) x Velocity (m/s)

unit is kg m/s

Question 2

Is momentum a scalar or a vector?

Answer 2

It has a size and a direction, so it is a vector

Question 3

The Law of Conservation of Momentum

Answer 3

In a closed system, the total momentum before an event is equal to the total momentum after the event.

Question 4

Conservation of momentum equation

Answer 4

(Mass of A x Velocity of A) = - (Mass of B x Velocity of B)

Question 5

The longer the impact time…

Answer 5

…The more the impact force is reduced.

Question 6

Impact Force =

Answer 6

Mass x Change of Velocity (change of momentum) / Time Taken

Question 7

Car Safety Features

Answer 7

> Seatbelts (Stop users from continuing forwards when the car stops)
Air Bags (Spreads the force of the impact over the upper body, increase impact time)
Child Car Seats (Protect children further)
Side Bars and Crumple Zones (Increase Impact Time)