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Gravity And Motion
Galileo Galilei demonstrated through dropping objects of different masses from the Leaning Tower of Pisa that all objects accelerate at the same rate when falling, disregarding air resistance. While heavier objects experience a greater gravitational force, they also have more mass and are thus equally difficult to accelerate. As a result, the acceleration due to gravity is the same for all objects and can be used to calculate change in velocity over time for falling objects. However, air resistance also affects the motion of falling objects depending on their size, shape, and speed.
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Gravity And Motion
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- 3. Objectives… Explain theeffect of gravity and air resistance on falling objects. Explain why objects in orbit are in free fall and appear to be weightless. Describe how projectile motion is affected by gravity.
- 4. GALILEO'S EXPERIMENT ONFALLING OBJECTS Galileo Galilei, who held a chair in mathematics at the University of Pisa, was impudent enough to question the common knowledge. The story has become part of the folklore of science: he is reputed to have dropped two different weights from the town's Leaning Tower showing that they landed at the same time. His challenges to Aristotle may have cost Galileo his job, but he had demonstrated the importance of taking nature, not human authority, as the final arbiter in matters of science.
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- 6. Gravity and AccelerationThe acceleration due to the gravity is the same for all objects. Why is this true? A heavier object experiences a greater gravitational force thana a lighter object does. But a heavier objects is also more difficult to accelerate because it has more mass, this produces a balance.
- 7. Acceleration due toGravity All the objects accelerate towards the Earth a rate of 9.8m/s/s. So, for every second that an object falls, its velocity increases in 9.8 m/s.
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- 9. Time (s) Velocity(m/s) 0 0 1 - 9.8 2 - 19.6 3 - 29.4 4 - 39.2 5 - 49.0
- 10. Can we calculatethe velocity of a falling object? Of course we can, by using the followwing equation. ΔV = g * t
- 11. AIR RESISTANCE ANDFALLING OBJECTS As an object falls through air, it usually encounters some degree of air resistance. The amount of air resistance depends on the size, shape and speed of the object.