Acceleration!

Acceleration Units: km/h2 or m/s2 The rate at which velocity changes A = velocity final - velocity initial vf-vi time t Units: km/h2 or m/s2

Positive Acceleration Analyze this graph! vel ocit y Positive Acceleration

Deceleration or negative acceleration Analyze this graph! vel ocit y Deceleration or negative acceleration

What is the acceleration of a car which starts at rest and increases speed to 100m/s in 5 seconds ? G: U: F: S: time = 5 seconds initial v = 0 m/s final v = 100 m/s Acceleration A = vf - vi t A = 100m/s 5s A = 20 m/s2 A = 100m/s – 0 m/s 5s

What is the acceleration of a car which starts at 200m/s and comes to a stop in 10 seconds ? G: U: F: S: time = 10 seconds initial v = 200 m/s final v = 0 m/s deceleration A = vf - vi t A = -200m/s 10s A = -20 m/s2 A = 0m/s – 200 m/s 10 s

The change in position over time compared to a reference point. motion

How fast an object moves or the rate of motion Speed!

Total distance divided by total time. Average Speed

Describes how fast an object moves (its speed) and direction. Velocity

The rate at which velocity changes. Acceleration

Skydiving: A Case Study Video on Skydiving When do you think you accelerate the most? Scientific Proof