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# 4 Gravity

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### 4 Gravity

1. 1. Gravity
2. 2. <ul><li>LAW OF UNIVERSAL GRAVITATION </li></ul><ul><li>Universal Law of Gravitation – all objects in the universe attract each other by the force of gravity. </li></ul><ul><li>The size of the force depends on the mass of the objects and the distance between them. </li></ul>
3. 4. With no air resistance why do the elephant and mouse fall together?
4. 5. <ul><li>FALLING OBJECTS </li></ul><ul><ul><li>The acceleration of a falling object is due to the force of gravity between the object and the earth. </li></ul></ul><ul><ul><li>Near the surface of the earth gravity is equal to </li></ul></ul><ul><li>9.8 m / sec 2 . </li></ul>
5. 6. Look at the forces
6. 7. Regardless of mass, acceleration due to gravity is always the same on Earth. 9.8 m/s 2 Every second an object falls it’s velocity increases by 9.8 m/s NO AIR RESISTANCE
7. 8. <ul><li>AIR RESISTANCE </li></ul><ul><li>Air resistance opposes the downward motion of falling objects ( fluid friction ). </li></ul><ul><li>As an object falls, the air resistance gradually becomes equal to the pull of gravity. </li></ul><ul><li>When this occurs the forces are balanced. </li></ul><ul><li>There can be no more acceleration and the object falls at a constant velocity. </li></ul><ul><li>This is called the terminal velocity . </li></ul>
8. 9. As an object falls with air resistance the force of air increases as the object increases speed. WHEN BALANCED = TERMINAL VELOCITY