Forces And Motion

Question 1

What is the equation for momentum

Answer 1

Momentum = mass x velocity 
P = m x v

Question 2

Relationship between weight, mass and gravitational field strength

Answer 2

Weight = mass x gravitational field strength 
W = m x g

Question 3

How do … reduce the risk of children being injured?

Answer 3

1) f = change in p / t
2) change in momentum for any surfaces
3) time is increased for (change in momentum)
4) so force is decreased
5) force is what causes injury

Question 4

Relationship between force, change in momentum and time

Answer 4

Force = change in momentum / time
F = change in p / t

Question 5

How to find final velocity?

Answer 5

(Final speed)^2 = (initial speed)^2 + ( 2 x acceleration x distance)

V^2 = u^2 + (2as)

Question 6

What is the equation for acceleration

Answer 6

Acceleration = change in velocity / time taken

a = (v-u) / t

Question 7

Equation for force

Answer 7

Force = mass x acceleration 
F = ma

Question 8

What is terminal velocity

Answer 8

The object moves at a steady speed in a constant direction because the resultant force acting on it is zero

1) object accelerates due to force of gravity
2) as speed increases so does drag
3) the forces balance and terminal velocity is reached