Physics unit 2.1 speed, distance and acceleration

How do you find the average speed travelled by an object?

Total distance travelled / total time taken

What is the unit for acceleration?

M/s squared

What is the unit for speed

M/s

On a distance time graph what does the gradient represent?

Speed

On a speed time graph what does the gradient represent?

Acceleration

on a speed distance graph how do you find the distance travelled?

Area under the graph

What is the difference between a scaler quantity and the vector quantity

scaler- has size only

vector- has size and direction

What does a horizontal line represent on a distance time graph

Stationary

What does a straight diagonal line represent on a distance time graph

Constant speed

What is the stopping distance of a vehicle?

Thinking distance + braking distance

What is the definition of a thinking distance

The distance travelled in a vehicle while you are reacting to a hazard

What is the definition of a braking distance?

The distance travelled in a vehicle while you are pushing the brakes

State 3 factors that affect your thinking distance?

Speed, distractions, alcohol

3 ways to reduce your braking distance

New brakes, lower speed, lower mass

What is the relationship between speed and thinking distance?

The thinking distance is proportional to the speed

what does a graph of braking distance against speed look like?

A curve with an increasing gradient