Table of Contents

- 1 How did Newton know that there was a force acting on the Moon?
- 2 How did Newton explain the fact that the Moon doesn’t fly off into space?
- 3 How does Newton’s first law of motion explain why a basketball rolls across the court?
- 4 How do you prove gravity?
- 5 Is the apple falling on Newton’s head true?
- 6 How does Newton’s third law impact Earth and the moon?
- 7 How did Sir Isaac Newton determine the motion of the planets?
- 8 How does the law of motion work on the Moon?

## How did Newton know that there was a force acting on the Moon?

Newton showed that if gravity at a distance R was proportional to 1/R2 (varied like the “inverse square of the distance”), then indeed the acceleration g measured at the Earth’s surface would correctly predict the orbital period T of the Moon.

**How did Isaac Newton prove his theory of gravity?**

The legend is that Newton discovered Gravity when he saw a falling apple while thinking about the forces of nature. Whatever really happened, Newton realized that some force must be acting on falling objects like apples because otherwise they would not start moving from rest.

### How did Newton explain the fact that the Moon doesn’t fly off into space?

Newton concluded that the orbit of the Moon was of exactly the same nature: the Moon continuously “fell” in its path around the Earth because of the acceleration due to gravity, thus producing its orbit.

**How does the force the Earth exerts on the Moon compare to the force the Moon exerts on the earth?**

The gravitational force exerted by by both Earth and the moon are equal in strength, but opposite in direction. The gravitational force exerted by Earth is greater because Earth is more massive. E. The gravitational force exerted by the Moon is less because the Moon weighs less.

## How does Newton’s first law of motion explain why a basketball rolls across the court?

Use Newton’s first law of motion to explain why a basketball rolls across the court. It will stay in motion until acted on by another force like another player or a wall. A basketball rolls across the court by the force of a human pushing or the wind.

**How did Newton come up with his laws?**

In it, he formulated his Three Laws of Motion, which were derived from Johann Kepler’s Laws of Planetary Motion and his own mathematical description of gravity. The first law, known as the “law of inertia”, states that: “An object at rest will remain at rest unless acted on by an unbalanced force.

### How do you prove gravity?

The constant of gravitation has been measured in three ways:

- The comparison of the pull of a large natural mass with that of Earth.
- The measurement with a laboratory balance of the attraction of Earth upon a test mass.
- The direct measurement of the force between two masses in the laboratory.

**How did Newton prove Kepler’s first law?**

In obtaining his solution to the two-body problem, Newton generalized Kepler’s first law. He deduced that when one body moves under the gravitational influence of another, the orbit of the moving body must be a conic section. Planets, satellites and asteroids have elliptical orbits.

## Is the apple falling on Newton’s head true?

There’s no evidence to suggest the fruit actually landed on his head, but Newton’s observation caused him to ponder why apples always fall straight to the ground (rather than sideways or upward) and helped inspired him to eventually develop his law of universal gravitation.

**How did Newton explain what the moon is doing and what did his explanation have to do with the apple falling?**

When he said the moon is falling, Isaac Newton caused a scientific revolution. Scientists in Newton’s day didn’t understand gravity very well. They explained that apples fell down because they were “earthy” things and their “natural home” was down on Earth.

### How does Newton’s third law impact Earth and the moon?

Newton’s Third Law explains force of moon on earth is equal and opposite to the force of earth on moon. The attactive force acting between an satellite orbiting the earth in a circular path causes the object to accelerate toward the earth, but as it keeps its circular orbit, it never gets closer to the earth!

**Which exerts more force the Earth pulling the moon or the moon pulling the Earth?**

Answer: Earth exerts a gravitational pull on the moon 80 times stronger than the moon’s pull on the Earth. Over a very long time, the moon’s rotations created fiction with the Earth’s tugging back, until the moon’s orbit and rotational locked with Earth.

## How did Sir Isaac Newton determine the motion of the planets?

Newton’s Laws of Motion If Kepler’s laws define the motion of the planets, Newton’s laws define motion. Thinking on Kepler’s laws, Newton realized that all motion, whether it was the orbit of the Moon around the Earth or an apple falling from a tree, followed the same basic principles.

**How does Newton’s first law of motion work?**

Gravity and friction are forces that constantly push and pull the “stuff” on earth. So, when we roll a ball, it slowly comes to a stop. On the moon, where there is less gravity and friction, “stuff” floats, and keeps floating. Try one of the experiments below to see Newton’s first law of motion in action.

### How does the law of motion work on the Moon?

A moving object will stay moving unless a force pushes or pulls it. Gravity and friction are forces that constantly push and pull the “stuff” on earth. So, when we roll a ball, it slowly comes to a stop. On the moon, where there is less gravity and friction, “stuff” floats, and keeps floating.

**When did Isaac Newton demonstrate the universal law of gravitation?**

Isaac Newton demonstrated his universal law of gravitation by showing that a comet visible during 1680 and 1681 followed the path of a parabola. [Adapted from Isaac Newton, 1687. Newton’s laws of motion and gravity explained Earth’s annual journey around the Sun.