OUTCOME
By the end of this lesson you will be able to staten Kepler's three Laws, you will be able to use Kepler's third law in calculations and you will be able to use newton's Law of universal gravity
Newton's Law's of gravity go well beyond
F= ma. He developed Universal Law of gravity which was based on previous investigations of the solar system by Kepler
Using Newton's Law of Universal Gravity and Cavendish's refinement into a mathematical relationship, we can determine the mass of the Earth
LEARNING TASKS
Explain
1. State Newton's universal law of gravity
2. Explain Newton's idea that both objects pull on each other.
3. What does G represent
4. What was the "three steps further" ?
5. State Kepler's laws
6. How did Cavendish determine a value of G?
Evaluate
Jacaranda - Ch 1.2 Qs 1-8
1. Use the Universal Gravity relationship to determine gE
2. Determine the force of gravity between the Earth and the Moon
3. Use the Universal Gravity relationship to determine the distance between Mars and the Sun,
1.611 x 1021 Newtons