# Acceleration (a = Δv/t)

I can calculate the acceleration and deceleration of objects.

# Acceleration (a = Δv/t)

I can calculate the acceleration and deceleration of objects.

## Slide deck

## Lesson details

### Key learning points

- Acceleration is equal to the amount that velocity changes in one second.
- Acceleration is the rate of change of velocity.
- Average acceleration = change of velocity / time (a = Δv/t)
- An object that is slowing down is decelerating.
- An object that is decelerating has a negative acceleration.

### Common misconception

Pupils often think that if velocity or speed is increasing, then acceleration must also be increasing. Pupils often don't associate a change in direction at a constant speed with an acceleration.

Before teaching acceleration, consolidate an understanding of the differences between velocity and changes in velocity. Discuss how an object can be accelerating AND travelling at a constant speed (circular motion).

### Keywords

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.

Velocity - The velocity of an object is the speed in a particular direction. This is the rate of change of displacement.

Delta v (Δv) - The change in velocity is represented by 𝚫v.

Rate of change - A rate of change is how much a quantity is changing by every second.

### 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

Loading...

## Worksheet

## Starter quiz

### 6 Questions

## Exit quiz

### 6 Questions

velocity -

how fast something is moving in a particular direction

rate of change -

how much a quantity changes each second

acceleration -

the rate of change of velocity

deceleration -

a change in velocity where the object is slowing down

delta v (𝚫$$v$$) -

a symbol used to represent change in velocity

velocity -

a vector measured in m/s

distance -

a scalar measured in m

acceleration -

a vector measured in m/s$$^2$$

speed -

a scalar measured in m/s

displacement -

a vector measured in m