a1_05_gravity_n_telescopes_v3

a1_05_gravity_n_telescopes_v3 - Isaac Newton(1642 1727 He...

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Isaac Newton (1642 – 1727) He developed the laws for Motion and Gravity
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Mass is different from Weight Mass: The amount of material in a body Weight: The force of gravity acting on this mass. What about the weightlessness of an astronauts?
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Newton’s 3 Laws of Motion 1. In the absence of force, a body at rest stays at rest, and a body in motion continues in motion in a straight line at a constant speed. Inertia . 2. When force is applied, a body's speed, or direction of motion, or both, will change. Force = mass x acceleration F = ma 3. For any force, there is always an equal and opposite reaction force.
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Energy: KE and PE Kinetic Energy : ½ mv 2 1 joule = (kg) (m 2 /s 2 ) Potential Energy : mg x h 1 joule = (kg) (m/s 2 ) m
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Newton’s Laws explain that something must be acting on the planets to keep them in orbit.
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Gravity acts downward on the surface of the planet – in the case of ‘weight’ of objects on the planet Gravity force also can act to keep planets in orbit – force acting toward Sun “pulling” on Earth, planets same is true for our Moon, other planets’ satellites Different Faces of Gravity:
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What determines how strong the force of gravity is ?
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This note was uploaded on 05/05/2010 for the course ASTR 001 taught by Professor Robertfesen during the Spring '10 term at Dartmouth.

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a1_05_gravity_n_telescopes_v3 - Isaac Newton(1642 1727 He...

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