# Calculating from velocity-time graphs (a = Δv/t)

I can read information from velocity-time graphs and calculate acceleration.

# Calculating from velocity-time graphs (a = Δv/t)

I can read information from velocity-time graphs and calculate acceleration.

## Slide deck

## Lesson details

### Key learning points

- A velocity-time graph shows how velocity changes with time.
- Acceleration is equal to the gradient of a velocity-time graph.
- A falling line shows decreasing velocity called deceleration, which is a negative acceleration.

### Common misconception

Pupils often consider time in the acceleration equation to be moment in time (perhaps read from a graph) rather than a change in time.

Label the value of t in the acceleration as a change of time rather than just time.

### Keywords

Displacement-time graph - A displacement-time graph shows the displacement of an object over a period of time.

Velocity-time graph - A velocity-time graph shows the velocity of an object over a period of time.

Acceleration - The acceleration of an object is the rate of change of velocity. This is how much the velocity changes per second.

Deceleration - Deceleration is used to describe a change in velocity where the object slows down.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Worksheet

## Starter quiz

### 6 Questions

## Exit quiz

### 6 Questions

displacement-time graph -

this shows the displacement of an object over a period of time

velocity-time graph -

this shows the velocity of an object over a period of time

acceleration -

the rate of change of velocity

deceleration -

used to describe an object which is slowing down