Key concepts

Question 1

Define Velocity

Answer 1

Velocity - rate of change in displacement

Question 2

Define Displacement

Answer 2

Displacement - shortest straight line between the start and finish

Question 3

Equation for velocity

Answer 3

Velocity = Displacement / Time

v = d/t

Units: m/s

Question 4

Define Momentum

Answer 4

Momentum - quantity of motion possesed by a moving object

Question 5

Give the equation for momentum

Answer 5

Momentum = mass x velocity

p = mv

Units: kgm/s

p = momentum

Question 6

Define inertia

Answer 6

Inertia - the resistance of a body to change its state of motion, whether at rest or while moving

Question 7

Define acceleration

Answer 7

Acceleration - the rate of change in velocity

Question 8

Give the equation for acceleration

Answer 8

Acceleration = (final velocity - initial velocity)/ time taken

a = (fv-iv)/t

Units: m/s/s or m/s^2

a = acceleration
fv = final velocity
iv = initial velocity
t = time

Question 9

Name five factors that increase acceleration

Answer 9

1. Increase force
2. Increase friction
3. Reduce mass
4. Reduce air resistance
5. Improve technique