II. Write the word True if the statement is correct and False if it is wrong.
___21. Friction is lesser on the rough surface.

___22. Friction is not a force.

___23. Friction is the force produced by rubbing two objects together.

___24. Friction is useful in our daily activities.

___25. Friction pulls everything to the center of the Earth.

___26. Gravity pulls everything to the edge of the Earth.

___27. If there is no gravity, we will all float in the air.

___28. Anything that is thrown upward falls down.

___29. Gravitational force between the two objects acts towards each other.

___30. Objects remain on air when it is thrown upward.​