Module 3: Forces And Motion

Question 1

Stopping distance

Answer 1

Total distance travelled from when the driver first sees a reason to stop, to when the vehicle stops
S= Sₜ + S(b)

Question 2

Thinking distance

Answer 2

Distance travelled between the moment when you first see reason to stop and the moment when you use the brakes

Sₜ = V t₀

Question 3

Braking distance

Answer 3

Distance travelled from the moment the brake is used and the car comes to a stop

Sb = u² / 2a

Question 4

Displacement

Answer 4

Distance of an object in a specific direction

Question 5

Velocity

Answer 5

Rate of change of displacement
Δs/Δt

Question 6

Speed

Answer 6

Change in distance per unit time

Question 7

Acceleration

Answer 7

Rate of change of velocity
Δv/Δt

Question 8

What are the units of acceleration?

Answer 8

ms^-2

Question 9

Gradient of a distance time graph

Answer 9

Represents speed

Question 10

Gradient of a displacement-time graph

Answer 10

Represents velocity

Question 11

Gradient of a velocity-time graph

Answer 11

Represents acceleration

Question 12

Area under a velocity-time graph

Answer 12

Represents change in displacement

Question 13

Area under a acceleration-time graph

Answer 13

Change in velocity

Question 14

When can SUVAT equations be used?

Answer 14

When there is a constant acceleration and motion along a straight line

Question 15

The effect of mass on an object in free fall

Answer 15

None