Motion Under Gravity (Physics)

The acceleration due to gravity of a catastrophic earthquake will be greater than 980 cm/sec² or 9.8 m/sec².

The mass of a body does not change with respect to gravity. It is the weight that changes due to increase or decrease in gravity. So the mass of body will remain the same as on the Moon as it was on the Earth.

The phenomenon of weightlessness occurs when there is no force to support on your body. When your body is effectively in 'free fall', accelerating downwards at the acceleration of gravity, then you are not being supported. The sensation of apparent weight comes from the support that you feel from the floor, from the seat etc. The term 'zero gravity' is often used to describe such condition.

The Earth spins and moves through space in an orbit around the sun. We don't 'feel' this movement because we are spinning and moving through space with the Earth. Since we are standing on the Earth, we move as much (and as fast) as the Earth moves. One way to recognize the Earth's movement is to look at objects that are not attached to Earth, like the Sun or stars. For example, if we are in a car which is moving at a constant speed on a smooth surface, we will not feel its motion. However, when the car accelerates or when the brakes are applied, we do feel the motion.

If the gravitational force of the Earth suddenly disappears, then the weight of an object will become zero but the mass will remain the same.

An artificial satellite orbiting around the Earth does not fall down because the gravitational attraction of the Earth which produces the necessary acceleration for its motion in a curved path.

Centripetal force is a real force that counteracts the centrifugal force and prevents the object from 'flying out,' keeping it moving instead with a uniform speed along a circular or elliptical path. Gravity is the centripetal force that keeps planets moving around the sun and satellites moving around planets.

Centripetal force is a real force that counteracts the centrifugal force and prevents the object from 'flying out,' keeping it moving instead with a uniform speed along a circular or elliptical path. Gravity is the centripetal force that keeps planets moving around the sun and satellites moving around planets

Gravitational force is the weakest force among the four fundamental forces while strong nuclear force holds the position of strongest force among them.