Match the terms to their definition. 1. friction force perpendicular to the surface between two objects; the attraction of gravity for an object on a level surface 2. lubricant substance used to make an object slippery or smooth; commonly, oil or grease 3. normal force the force that resists moving one object against another

Explanation:

1. Gravitational attraction            

  Gravitational attraction is a force for an object that acts on the level surface of the objects and between two objects having masses. It is the frictional force which acts perpendicular to the surfaces of the two objects.

2. Lubricant

 Lubricant is defined as a substance which is used to eliminate friction or wear and tear. It makes an object run smooth and slippery. They are used between two mutually contacting surfaces. Some of the examples of lubricants are oil, ointments, grease, etc.

3. Normal force

 Normal force is a force that can resist moving of one object over or against another. It is a contact force and it exist when there is contact between two objects.

friction: the force that resists moving one object against another

lubricant: substance used to make an object slippery or smooth; commonly, oil or grease

normal force: force perpendicular to the surface between two objects; the attraction of gravity for an object on a level surface

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