Forces And Motions- Triple

Question 1

Difference between a scalar and a vector?

Answer 1

Scalar: only has a size
Vector: they have a size and a direction

Question 2

What’s the principle of moments

Answer 2

If an object is balanced: total anti-clockwise moments = total clockwise moments

Question 3

Momentum =

Answer 3

Mass(KG) x velocity(m/s)

Question 4

Force=

Answer 4

Change in momentum(KG m/s) / time taken(s)

Question 5

What’s Newton’s third law

Answer 5

If object A exerts a force acting on object B, then object B exerts the exact same opposite force on object A

Question 6

Air bags

Answer 6

Slows you down gradually

Question 7

Crumple zones

Answer 7

At the front and back of car and increases the time taken for the car to stop

Question 8

Seat belts

Answer 8

Increases time taken for wearer to stop which reduces the force acting on chest