# Acceleration

## definitions:

Acceleration- a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.

SIMPLIER DEF:

the rate at which velocity changes

• Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
• The acceleration of an object tells you how fast the velocity of the object is changing.

You are accelerating whenever you speed up, slow down, or change direction.

Acceleration has nothing to do with going fast. A person can be moving very fast and still not be accelerating. Acceleration has to do with changing how fast an object is moving. If an object is not changing its velocity, then the object is not accelerating.

## Practice questions:

1. A car's velocity changes from +2 m/s to +10 m/s in 4 seconds. What is its acceleration?

2. when your velocity is changing, you are accelerating.

3.acceleration is a change in velocity.

4. acceleration is a "rate of a rate"