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Frictional force acts in the ______________________ direction to the way an object wants to move.

• frictional force

• reduce

• harmful

• opposite

Concrete (solid) on concrete objects nave a very high ___________________.

• frictional force

• useful

• harmful

• slow down

Wear and tear on appliances and machines illustrates _______________ effect of frictional forces.

• bad

• good

• harmful

• wonderful

Oil, lubricant, and rollers are used to _______________ friction.

• slowdown

• reduce

• gain

• slip

When there is no friction between your shoes and the floor, you will _____________ when you take a step.

• slip

• slowdown

• harmful

• opposite