# Conservation of Energy - PowerPoint PPT Presentation

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Conservation of Energy. Activity. Kinetic Energy should equal Potential Energy. What do you expect to happen when you drop a ball from a surface to the ground? What should happen to your potential energy? How should your potential energy compare to your kinetic energy?.

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Conservation of Energy

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## Conservation of Energy

### Activity

• Kinetic Energy should equal Potential Energy.

• What do you expect to happen when you drop a ball from a surface to the ground?

• What should happen to your potential energy?

### What do we need to calculate Potential Energy?

• Mass

• Gravitational acceleration (9.8m/s2 )

• Height/distance

### Step 1

• Measure the mass of the softball.

• Measure the distance from the floor to the top of the counter/table/chair (whichever you decide to drop them from).

• Calculate Potential Energy.

• GPE = mgh

• Remember energy is calculated in Joules!

### Hmmm…

• KE= ½ mv2

• If KE=PE, take the number you calculated for GPE and substitute it in this equation. Predict the velocity of the softball when you drop it.

### What do we need to calculate Kinetic Energy?

• Mass

• Velocity

• Step 2:

• Drop the ball.

• Time how long it takes to drop.

• Record the Time.

• Calculate Velocity (m/s).

### Kinetic Energy

• Calculate Kinetic Energy

• KE= ½ mv2

• Calculate the difference between the values.

### What happened?

• How big of a difference was there between kinetic energy and potential energy?

• What do you believe caused this difference?