Understanding Gravitation in Class 9

What is the universal law of gravitation?

• The universal law of gravitation states that all objects repel each other.

• The universal law of gravitation only applies to planets and stars.

• The universal law of gravitation describes the gravitational attraction between two masses.

• The universal law of gravitation is a theory that has been disproven.

How does the mass of an object affect its gravitational force?

• The mass of an object has no effect on its gravitational force.

• The mass of an object increases its gravitational force.

• Gravitational force is only affected by distance, not mass.

• Increasing mass decreases gravitational force.

What is the difference between mass and weight?

• Mass is the amount of matter; weight is the force of gravity on that mass.

• Weight is the amount of matter; mass is the force of gravity on that matter.

• Mass and weight are the same thing; they both measure force.

• Mass is the weight of an object; weight is the mass of an object.

Explain how gravitational force varies with distance.

• Gravitational force increases with distance.

• Gravitational force varies inversely with the square of the distance.

• Gravitational force is constant regardless of distance.

• Gravitational force varies directly with the distance.

What role does gravity play in the motion of planets?

• Gravity is the force that keeps planets in orbit around stars by balancing gravitational attraction and inertia.

• Gravity causes planets to move in a straight line away from stars.

• Gravity has no effect on the speed of planets in their orbits.

• Gravity only affects the size of planets, not their motion.