This text is meant to accompany class discussions. It is not everything there is to know about uniform circular motion. It is meant as a prep for class. More detailed notes and examples are given in the class notes, presentations, and demonstrations (click here.)

Click for the questions that go with this reading

Velocity

Acceleration is defined as how quickly a body changes velocity in a direction. It is a vector.

Notice that a higher acceleration yields a greater change in velocity. Acceleration is used to calculate the change in velocity. The positive acceleration increases the velocity.

The negative acceleration reduces the velocity in a more negative direction. A negative acceleration does not mean a negative velocity. It means a change in velocity in the negative direction.

Example

A car is traveling at 30 m/s when the brakes are applied with a constant deceleration of 2 m/s^{2}. What is the change in velocity after 5 seconds?

Solution

Givens
v_{o} = 30 m/s
a_{} = 2 m/s^{2}

Example 2

An airplane experiences an acceleration of 10 m/s^{2} for 3 seconds. What is the plane's change in velocity?