Physics 2.1 Distance, Speed And Acceleration

Distance speed time equation,Distance equals speed multiplied by time distance in metres speed in metres per second time in seconds

Speed from a distance time graph,Speed is equal to the gradient of the distance time graph

Speed at a given time for an accelerating object,Draw a tangent to the curve at the required time and calculate the gradient

Average acceleration equation,Acceleration equals change in velocity divided by time taken acceleration in metres per second squared velocity in metres per second time in seconds

Distance from a velocity time graph,Distance travelled is equal to the area under the velocity time graph

Stopping distance,The sum of thinking distance and braking distance

Effect of increased speed on stopping distance,Stopping distance increases when speed increases

Effect of speed on thinking and braking distance,Both thinking distance and braking distance increase as speed increases

Typical human reaction time,Between 0.2 seconds and 0.9 seconds

Factors affecting reaction time,Tiredness drugs and alcohol

Factors affecting braking distance,Wet or icy road conditions and poor tyre or brake condition