1. Acceleration Definition 2 ways to do it Positive acceleration Negative acceleration (deceleration) A change in velocity Change speed and/or Change direction Speeding up Slowing down

2. An airplane’s acceleration at take off is about 5 m/s 2. That means … the speed at 1 second is 5 m/s the speed at 2 seconds is 10 m/s the speed at 3 seconds is 15 m/s 5 m/s 2 means that each second, the plane is going faster and faster by 5 m/s Another way of writing 5 m/s 2 is 5 m/s/s.

3. Calculating Acceleration Acc = (final velocity – beginning velocity) time