Gravitation | MCQs

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

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 gravitational field of Earth is a vector field that points towards the center of the Earth.

It representing the direction of the gravitational force that the Earth exerts on objects near its surface.

This means that the gravitational field is directed towards the Earth, pulling objects towards its center.

Explanation

G is the gravitational constant, also known as the universal gravitational constant.

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

The currently accepted numerical value of G is 6.673 × 10^-11 Nm^2 kg^-2.

Explanation

The motion of a falling ball towards Earth is due to the gravitational force.

Gravitational force is the force that attracts the ball towards the Earth, causing it to accelerate downwards.

Explanation

Black holes are some of the strangest and most fascinating objects in outer space.

They're extremely dense, with such strong gravitational attraction that even light cannot escape their grasp if it comes near enough.

Explanation

• Gravitational potential is always negative, because it is defined as the work done per unit mass to bring an object from infinity to a given point in a gravitational field.
• Since the force of gravity is attractive, work must be done to move an object against the force of gravity, and this work is negative.

Explanation

The gravitational constant (G) is given by F = G * (m1 * m2) / r².

Unit of G = N * m² / (kg * kg) = Nm²kg⁻².