We do not know how to turn off the force of gravity. But we do know how to balance it. For example, when you are seated the downward force of gravity is balanced by the upward thrust of the chair. You can feel the balancing force. It definitely is not there if someone removes the chair as you seat yourself. Similarly the thrust of the floor on you feet balances the force of gravity on your body when you are standing.

When you throw a ball, the force of gravity makes the ball fall towards the earth during every instant of its flight. In the same way, as Newton pointed out, the moon and other satellites also fall towards the earth. If their velocity, at right angles to this fall, is of the right size, when they will travel in a circular path.

The motion of objects is generally more complex than the straight-line motion that you have studied so far. To acquaint youself with the motion of a thrown football, a speeding bullet, or a grasshopper, you will study a ball which is thrown horizontally and is falling vertically at the same time.

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