B. Write True if the statement is correct and change the underlined word/s if it is wrong.
1. Gravity is a contact force that acts between two separate objects.
2. Gravity is the force exerted by the Earth which is equivalent to the mass of an object.
3. Gravity on the Moon is less than the gravity on the Earth.
4. Friction, unlike gravity, is a noncontact force.
5. Friction keeps objects from sliding off surfaces.
6. The principle of gravity was discovered by Sir Isaac Newton.
7. Friction is the force that opposes the push of gravity on objects.
8. The lesser the mass of an object, the greater the pull of gravity on it.
9. Gravity keeps anything from going up.
10. Gravitational pull between objects increases as the distance between them decreases.​