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# Free fall

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### Free fall

1. 1. FREE FALL<br />
2. 2. Freely falling<br />If air resistance is disregarded, all objects dropped near the surface<br />of a planet fall with the same constant acceleration. This acceleration<br />is due to gravitational force, and the motion is referred to as free fall.<br />
3. 3. Freely falling<br />The acceleration due to gravity is denoted with the symbols ag (generally)<br />or g (on Earth’s surface). The magnitude of g is about 9.81 m/s2.<br />
4. 4. Acceleration is constant during upward and downward motion<br />In the photograph on the left, the upward displacement of the ball<br />between each successive image is smaller and smaller until the ball stops and finally begins to move with an increasing downward velocity, as shown on the right.<br />
5. 5. Formulas <br />
6. 6. A robot probe drops a camera off the rim of a 239 m high cliff on Mars, where the free-fall acceleration is −3.7 m/s2.<br />a. Find the velocity with which the camera hits the ground.<br />b. Find the time required for it to hit the ground.<br />
7. 7. A flowerpot falls from a windowsill 25.0 m above the sidewalk.<br />a. How fast is the flowerpot moving when it strikes the ground?<br />b. How much time does a passerby on the sidewalk below have to move out of the way before the flowerpot hits the ground?<br />
8. 8. A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s.<br />a. What will the ball’s speed be when it returns to its starting point?<br />b. How long will the ball take to reach its starting point?<br />
9. 9. Jason hits a volleyball so that it moves with an initial velocity of 6.0 m/s straight upward. If the volleyball starts from 2.0 m above the floor, how long will it be in the air before it strikes the floor?<br />