a1_05_gravity_n_telescopes_v3

# a1_05_gravity_n_telescopes_v3 - Isaac Newton(1642 1727 He...

This preview shows pages 1–8. Sign up to view the full content.

Isaac Newton (1642 – 1727) He developed the laws for Motion and Gravity

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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?
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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
Newton’s Laws explain that something must be acting on the planets to keep them in orbit.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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:
What determines how strong the force of gravity is ?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 05/05/2010 for the course ASTR 001 taught by Professor Robertfesen during the Spring '10 term at Dartmouth.

### Page1 / 38

a1_05_gravity_n_telescopes_v3 - Isaac Newton(1642 1727 He...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online