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# 7-5 Newtons Third Law

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### 7-5 Newtons Third Law

1. 1. Warm - Up<br />When does a skydiver feel “weightless?”<br />When the skydiver is falling while accelerating.<br />When does a sky diver feel heavier?<br />When the skydiver’s parachute deploys.<br />When does the skydiver feel normal weight?<br />When the skydiver is at constant (terminal) velocity.<br />
2. 2. Sustained Silent Read<br />Read p. 372 – 377<br />Write five things that you have learned from the reading.<br />
3. 3. 7-5 – Newton’s 3rd Law<br />Relate the mass of an object to its weight.<br />RelateNewton’s 3 laws to each other. <br />Explain action-reaction forces.<br />
4. 4. Weight vs. Mass<br />The force of gravity is less on the moon then on earth. <br />So a person on the moon would weight less on the moon then on the earth.<br />But their mass is the same!!!!<br />Mass is a measure of the inertia of an object.<br />Weight is a measure of the force of gravity acting on a object.<br />
5. 5. Newton’s Third Law:<br />Action-Reaction Forces<br />For every action, there is an equal and opposite reaction.<br />Hand pushes on the wall, the wall pushes on the hand.<br />Foot kicks the ball, ball applies a force to the foot.<br />Both objects “feel” the force.<br />
6. 6. Key to Action-reaction Pairs<br />Action reaction pairs don’t cancel<br />Action forces act on a different object then the reaction force.<br />Only forces that act on the same object can cancel and result in net force of zero.<br />Action-reaction forces can cause motion.<br />Swimmer pushes back on the water; water pushes forward on swimmer, swimmer moves forward.<br />Not all action-reaction forces cause motion.<br />
7. 7. 7-5 Summary<br />Identify five action reaction pairs.<br />