Question

Answer the following.

1. Define centripital force.

2. What is an ellspse ?

3. State Kepler’s Law and Write the three laws given by Kepler. How did they help Newton

to arrive at the inverse square law of gravity?​

Answer 1

1. a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.
2. a regular oval like a circle that has been pressed in from two sides
3. Kepler's laws apply: First Law: Planetary orbits are elliptical with the sun at a focus. Second Law: The radius vector from the sun to a planet sweeps equal areas in equal times. Third Law: The ratio of the square of the period of revolution and the cube of the ellipse semimajor axis is the same for all planets.

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Answer 2

Explanation:

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