Physics WJEC GCSE Unit 2.1 Distance, speed and acceleration

Double or Triple award

What 4 words describe Motion of a body?

What 4 words describe Motion of a body?

1. stationary

2. Constant Speed or Velocity

3. Accelerating

4. Decelerating

What graphs display motion?

1. Distance-time

2. Velocity-time

Equation for speed/velocity?

Speed (m/s) = Distance (m) / Time (s)

Equation for Acceleration/Deceleration?

Acceleration (m/s²) = Change in velocity (m/s²) / Time (s)

How can you calculate acceleration/deceleration from a velocity-time graph?

Using the gradient of the line

What is Thinking Distance?

Depends on the reaction time of the driver

Distance between seeing hazard and applying breaks

What Factors affect Thinking Distance?

1. Speed

2. Alcohol and Drugs

3. Tiredness

4. Mobile Phones

What is Braking Distance?

The Distance the car travels whist Braking

Factors affecting Breaking Distance?

1. Speed

2. Road Conditions

3. Mass of the Car

4. Condition of the Tyres

5. Conditions of the Brakes

What is Total Stopping Distance?

Thinking Distance add Braking Distance

Define Acceleration

The rate of change of speed

or

How much speed changes every second

Define Velocity

Speed, but can be negative or positive depending on direction