### Monday 11/16

**Prelude: Free body diagram
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Objective: a force requires a change in velocity or acceleration.

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**Notes on work:**

**Work= force* distance**

**Work is the change in energy of something. **

**Work = change in kinetic energy. **

**Kinetic energy: Energy of motion. Equation = 1/2mv ^{2}**

**Potential energy: energy of position **

**PE = mgh**

**Potential energy: a bow, an object elevated. Something that has a force acting on it but no work. **

**Introduce lab. Students will drop balls first and then measure the mass of their ball. 3 balls per group if possible. Two timers per group if possible.
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