A constantly changing velocity

Accelerated Motion

Acceleration Acceleration: the rate at which velocity changes Acceleration = Unit:

Remember, velocity is how fast (speed) AND in what direction. If either speed OR direction changes, the velocity has changed, which means that there is an acceleration!

Constant velocity means that neither the speed nor the direction of motion can change. A race car driving around a circular path at a constant 80 mi/h has a constant speed but not a constant velocity since its direction is changing.

An object accelerates when its speed OR its direction changes! So……

How to tell if you accelerated too quickly from a red light.

Positive or Negative? Choose a direction for + and – then stick with it: forward and up- positive backwards and down- negative Going forward, speeding up Going forward, slowing down Going backward, speeding up Going backward, slowing down Positivepositive positivenegativenegative negativepositive VelocityAcceleration

KEY WORDS “stops” The final velocity is zero, v f = 0 “at rest” The original velocity is zero, v o = 0 d (m) = displacement- the change in your position v O (m/s) = original velocity v f (m/s) = final velocity t (s) = time a (m/s 2 ) = acceleration The Kinematics Equations Are used to analyze motion with uniform acceleration