1. Kinematics AP Physics 1

2. Defining the important variables Kinematics is a way of describing the motion of objects without describing the causes. You can describe an object’s motion: In wordsMathematicallyPictoriallyGraphically No matter HOW we describe the motion, there are several KEY VARIABLES that we use. SymbolVariableUnits Time Acceleration Displacement Initial velocity Final velocity Acceleration due to gravity

3. The 3 Kinematic equations There are 3 major kinematic equations that can be used to describe the motion in DETAIL. All are used when the acceleration is CONSTANT.

4. Example #1 Example: A boat moves slowly out of a marina with a speed of 1.50 m/s. As soon as it passes the breakwater, leaving the marina, it throttles up and accelerates at 2.40 m/s 2. How fast is the boat moving after accelerating for 5 seconds?

5. Example #2 You are driving through town at 12 m/s when suddenly a ball rolls out in front of your car. You apply the brakes and begin decelerating at 3.5 m/s 2. How far do you travel before coming to a complete stop?

6. Example #3 A car accelerates from 12.5 m/s to 25 m/s in 6.0 seconds. What was the acceleration?

7. Example #4 A car starts from rest and accelerates uniformly at a rate of a for a time t and travels a distance d. If the rate of acceleration is doubled the distance traveled will be closet to which of the following?

8. Example #5: A stone is dropped at rest from the top of a cliff. It is observed to hit the ground 5.78 s later. How high is the cliff?

9. Example #6 A pitching machine throws a fastball with a velocity of 15.0 m/s. The ball is inserted into the back of a tube that has a length of 1.25 meters. The ball is “fired” out of the other end towards the batter. How much time elapses from the time the ball is inserted in one end of the tube until it is fired from the other end?