When we push anb object like a school bag or lift a bucket of water, where does the force come from?

Why does an object float or sink when placed on the surface of water?

Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2. Where should the object be placed to obtain a magnification of 1/3?

What does the path of an object look like when it is in uniform motion?

What happens to the image distance in the eye when we increase the distance of an object from the eye?

When a boat is moving in the river, does the water offer force of friction to its movement ?