Newton's Discovery of Gravity

What was the common belief about planetary motion before Newton's discovery?

• Planets were pushed from behind.

• Planets moved in perfect circles.

• Planets were stationary.

• Planets moved randomly.

What did Galileo's law of inertia state about moving objects?

• They stop immediately without a force.

• They need a constant force to keep moving.

• They continue moving at the same velocity unless acted upon by a force.

• They change direction without any force.

What did Kepler observe about the areas swept by planets?

• They increase over time.

• They decrease over time.

• They are equal in equal time intervals.

• They are always different.

How did Newton connect Galileo's and Kepler's findings?

• By demonstrating planets are pulled towards the sun.

• By proving planets are stationary.

• By suggesting planets move in perfect circles.

• By showing planets are pushed from behind.

What geometric shape is used to explain the law of equal areas?

• Rectangles

• Triangles

• Circles

• Squares

What does the law of equal areas imply about the direction of gravitational force?

• It is away from the sun.

• It is towards the sun.

• It is random.

• It is parallel to the orbit.

How does the strength of the gravitational force affect the law of equal areas?

• It halves the areas.

• It doubles the areas.

• It has no effect on the areas.

• It changes the areas.

What would happen if the gravitational force was repulsive?

• Planets would move in straight lines.

• Planets would stop moving.

• Planets would move in perfect circles.

• Planets would still obey the law of equal areas.

What is the relationship between the force of gravity and distance according to Newton?

• It increases with distance.

• It decreases with distance squared.

• It remains constant.

• It is unrelated to distance.

What did Newton use to arrive at the inverse square law of gravity?

• Kepler's first law

• Kepler's third law

• Galileo's experiments

• Aristotle's theories