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# Force & Motion 3

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### Force & Motion 3

1. 1. Force & Motion 3
2. 2. Weight and Mass <ul><li>Mass is the measure of the inertia of an object and depends on the amount of matter the objects contains </li></ul>
3. 3. Weight and Mass <ul><li>Weight is the force of gravity acting on an object </li></ul>
4. 4. Weight and Mass <ul><li>An objects weight is the product of the mass and acceleration due to gravity acting on it </li></ul><ul><li>W = m  g </li></ul><ul><li>F = m  a </li></ul><ul><li>g = 9.8 m/s² </li></ul>
5. 5. Newton’s 3 rd Law <ul><li>Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object </li></ul>
6. 6. Newton’s 3 rd Law <ul><li>Force exists in pairs </li></ul><ul><li>Action and Reaction </li></ul>
7. 7. Newton’s 3 rd Law <ul><li>THINK </li></ul><ul><li>If a marble were moving 100 times faster then a shopping cart, which would be easier to stop? </li></ul>
8. 8. Newton’s 3 rd Law <ul><li>The action and reaction forces do not always act on the same object </li></ul>
9. 9. Newton’s 3 rd Law <ul><li>Momentum = the object’s mass  objects velocity </li></ul><ul><li>M = m  v </li></ul><ul><li>Measured in kg-m/sec </li></ul>
10. 10. Newton’s 3 rd Law <ul><li>Conservation of momentum </li></ul><ul><li>If no net force acts on a system, then the total momentum of the system does not change </li></ul>
11. 11. Newton’s 3 rd Law <ul><li>Conservation of momentum </li></ul><ul><li>In a closed system, the loss of momentum of one object equals the gain in momentum of another object </li></ul>