1. Potential and Kinetic Energy Aim: How can we determine the different types of energy an object has?

2. Potential Energy The energy possessed by an object due to its position (HEIGHT) or condition Potential Energy Units: Joules (J) Mass Units: (kg) Gravity Units: 9.81m/s 2 Height Units: meters (m)

3. Example #1 How much potential energy does a 2kg book have when it is on a shelf that is 1.75m above the ground?

4. Example #2 Mr. O (80kg) is done shopping on the second floor of the mall and needs to stop by the Apple store that is on the 3 rd floor. If the second floor is 3m above the ground and the third floor is 6m above the ground, how much potential energy did Mr. O gain?

5. Kinetic Energy The energy of a MOVING object Kinetic Energy Units: Joules (J) Mass Units: (kg) Velocity Units: (m/s)

6. Example #3 How much kinetic energy does a 180g softball have when its pitched at a speed of 35m/s?

7. Example #4 How fast must a 1325kg Prius travel in order to have 2.65×10 5 J of kinetic energy?

8. Elastic Potential Energy The energy stored in an elastic object (spring) when work is done to compress or extend it Elastic Potential Energy Units: Joules (J) Spring Constant Units: (N/m) Spring Compression/ Extension Units: (m)

9. Example #5 How much energy is stored in a 100N/m spring that is compressed 0.3 meters?

10. Example #6 2.5kg of tomatoes is placed on a produce scale. How much stored energy does the spring have if the spring constant is 750N/m? F s = F g