The value of the universal gravitational constant G is approximately:

The universal law of gravitation was proposed by:

Weight of a body is the force of gravity acting on its:

According to Kepler's third law, the square of the orbital period of a planet is proportional to:

An astronaut in orbit experiences apparent weightlessness because:

A collision in which kinetic energy is not conserved is called:

Gravitational potential energy between two masses is always:

Which of the following best describes 'inertia'?

The gravitational force between two objects increases when:

The escape velocity from Earth's surface is approximately:

Which planet has the strongest surface gravity in our solar system?