Forces and Motion - Forces, Movement, Shape and Momentum (Paper 2)

Question 1

what is the relationship between momentum, mass and velocity?

Answer 1

momentum (kgm/s)= mass (kg) x velocity (m/s)

Question 2

how is momentum useful for safety features?

Answer 2

to reduce the force experienced by the passenger you need to extend the time for a passenger to stop in a collision

Question 3

what is the law of conservation of momentum?

Answer 3

momentum before the collision = momentum after the collision

Question 4

what is the relationship between force, change in momentum and time taken?

Answer 4

Force (N) = change in momentum (kgm/s) / time (s)

Question 5

what is Newtons 3rd law?

Answer 5

Every action has an equal and opposite reaction.

Question 6

what is the relationship between the moment of a force and its perpendicular distance from the pivot?

Answer 6

moment = force x perpendicular distance from the pivot

Question 7

where does the weight of a body act?

Answer 7

through its centre of gravity

Question 8

what is the principle of moments?

Answer 8

when the clockwise moments are equal to the anticlockwise moments a body will be in equilibrium