An object may not always be travelling at the same speed. It may speed up, or ____ down. Acceleration is a measure of how ____ something is speeding up or slowing down. If the speed is increasing rapidly, the acceleration is ____. If the speed is increasing slowly, the acceleration is ____. When an object slows down, we call this a ____. A deceleration is just an ____ with a negative value. The units of acceleration are metres per second per ____. This is written as ____ for short. Since acceleration is the change in speed per second, the formula is a = (Δv)/t. The Δ symbol is the Greek letter ____, and Δv means ____ in speed.

3. Acceleration

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