Explanation

Rockets are used to put satellites into orbit around the Earth.

Rockets provide the necessary thrust and velocity to overcome the Earth's gravitational pull and reach the desired altitude and orbit.

Explanation

A communication satellite in a geostationary orbit completes one revolution around the Earth in 24 hours.

This is the same amount of time it takes the Earth to rotate once on its axis.

Explanation

• Your weight, as measured on Earth, will be decreased if you move to a planet or moon with a weaker gravitational field.
• Weight is the force exerted on an object by gravity.
• It depends on both the mass of the object and the strength of the gravitational field.

Explanation

A spring balance is a device used to measure the weight of an object.

It consists of a spring that is stretched or compressed by the weight of the object, and a pointer or dial that indicates the weight.

Explanation

The gravitational force between two masses is mutual; each mass exerts an equal and opposite force on the other,.

It aligns with Newton's 3rd law of motion: for every action, there is an equal and opposite reaction.

Explanation

The gravitational force between two objects is independent of the medium between them.

Gravity acts through a vacuum just as it does through a medium like air, water, or solid objects.

The presence or absence of a medium does not affect the gravitational force between the objects.

Explanation

The numerical value of G (the gravitational constant) remains constant everywhere in the universe, regardless of the location, time, or conditions.

G is a fundamental constant of nature that describes the strength of gravitational attraction between objects.

Explanation

Gravitational force is always attractive, never repulsive.

According to Newton's law of universal gravitation, every point mass attracts every other point mass by a force acting along the line intersecting both points.

This means that gravity always pulls objects towards each other, never pushes them apart.

Explanation

According to Newton's law of universal gravitation, the force of gravity (F) is proportional to:

• The product of the two masses (m1 and m2): F ∝ m1 m2
• The inverse square of the distance (r) between the centers of the two objects: F ∝ 1/r^2

Explanation

The first scientist who gave the concept of gravitation was Sir Isaac Newton.

He published his groundbreaking work, "Universal Law of Gravitation," in 1687.

It explained how gravity works and how it affects objects on Earth and in the universe.