Exercise

The force of gravitation:

            There exists a force due to which everybody in the universe attracts every other body. This force is called the force of gravitation.

The answer to the question can be found in two ways. First, we can use Newton’s Third Law. If object “A” exerts a force on object “B”, then object “B” will exert an equal force back on “A”. This makes it pretty clear the forces are equal.

Second, we can use Newton’s Law of Gravitational force. “The force that one mass exerts on second mass is proportional to the product of the two masses”. This means if we calculate the force the Earth exerts on us, we multiply the Earth’s mass times our mass. And if we calculate the force we exert on the Earth, we gain multiply the two masses. In other words, we do the same calculation, so we will get the same answer.

Field force:

             The gravitational pull of the Earth acting on the body whether the body is in contact with the Earth or not is called field force.