Table of Contents

## What law did Newton describe that holds planets in orbit?

Newton’s First Law of Motion states that a body in motion keeps the same motion unless acted upon by an outside force. Likewise, if it is not moving, it remains that way unless a force acts on it. The force of gravity causes the moving planets to travel in roughly circular orbits around the sun.

### What are the two factors that affect gravity?

When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.

**How did Newton’s ideas about the orbits of planets differ from Kepler’s?**

How did Newton’s ideas about the orbits of planets differ from Kepler’s ideas. Kepler said that planets change speed in their orbit around the sun in order to cover equal areas in equal periods of time (2nd law). Newton said that these were due to differences in inertia and gravity.

**What force keeps the planets in orbit around the sun?**

gravity

First, gravity is the force that pulls us to the surface of the Earth, keeps the planets in orbit around the Sun and causes the formation of planets, stars and galaxies.

## What did Newton conclude that keeps objects in orbit?

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. The constant of proportionality G is known as the universal gravitational constant.

### What 2 factors affect friction?

Answer: Friction is a resistive force, which comes into play when there is a relative motion between two bodies in contact. The frictional force between two bodies depends mainly on three factors: (I) the adhesion between body surfaces (ii) roughness of the surface (iii) deformation of bodies.

**How did Isaac Newton’s work help explain planetary orbit?**

Newton developed a mathematical formulation of gravity that explained both the motion of a falling apple and that of the planets. He showed that the gravitational force between any two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.

**How did Newton’s approach to understanding planetary motions differ from that of his predecessors?**

How did Newton’s approach to understanding planetary motions differ from that if his predecessors? He was the first to understand that gravity held the planets and moons in orbit. Kepler before him had once thought it might be magnetism. What is the difference between mass and weight?

## How do planets keep in orbit?

Gravity is the force that keeps planets in orbit around the Sun. Gravity alone holds us to Earth’s surface. Planets have measurable properties, such as size, mass, density, and composition. A planet’s size and mass determines its gravitational pull.

### What two main factors keep a planet in motion?

The gravity of the sun and the planets works together with the inertia to create the orbits and keep them consistent. The gravity pulls the sun and the planets together, while keeping them apart. The inertia provides the tendency to maintain speed and keep moving.

**What is the conclusion about the orbit of a planet?**

Answer: conclusion : In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory.

**What are the two factors that determine the strength of the force of friction between two sliding objects?**

The two factors that determine the strength of the force of friction between two sliding objects are the mass of the object, coefficient of friction.