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# 4 action and reaction

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### 4 action and reaction

1. 1. Action and Reaction
2. 2. <ul><li>Newton’s 3 rd law of motion- to every action there is an equal and opposite reaction. </li></ul><ul><li>Ex: Trampoline. When a person jumps downward on a trampoline, the trampoline exerts an equal and opposite force upward. </li></ul>
3. 3. <ul><li>What causes rockets to go into space? </li></ul><ul><li>The escaping gases from the rocket is the reaction while the rocket accelerates </li></ul>
4. 4. <ul><li>Momentum - a property a moving object has because of its mass and velocity. </li></ul><ul><li>Ex: Speeding bullet has large momentum because of its high velocity. </li></ul><ul><li>Ex: Elephant has large momentum because of its large mass. </li></ul>
5. 5. <ul><li>Law of conservation of momentum- the total amount of momentum does not change unless outside forces act on the object. </li></ul>
6. 6. Moving s = 20 m/s Stop s = 0 m/s
7. 7. Slow down s = 10 m/s Moving s =10 m/s
8. 8. <ul><li>Momentum Equation </li></ul><ul><li>Variable Ending Units </li></ul><ul><li>P = Momentum kg m/s </li></ul><ul><li>m = mass kg </li></ul><ul><li>v = velocity m/s </li></ul>.
9. 9. <ul><li>Momentum Equation </li></ul><ul><li>P = m X v </li></ul><ul><li>m = P / v </li></ul><ul><li>v = P / m </li></ul>. . . . X P m v