science

1. Friction is a force that always acts ____________

• opposite to the object's natural motion

• in the same direction as the object's motion

• different direction as the object's motion

• perpendicular to the object's motion

2. Which of the following is thebest description of friction?

• Friction is never a total advantage

• Friction can never be eliminated

• Friction is eliminated

• Both A and B

3. Friction encreases with ________________

• weight

• volume

• An increase in surface area

• A decrease in surface area

4. All materials below can help reduce friction EXCEPT ____________

• ball bearings

• lubricants

• sand

• wax

5. All materials below can help increase friction EXCEPT ____________

• using rubber

• increasing the weight

• using rough surfaces

• applying wax

6. The law of inertia applies to ____________.

• moving objects

• objects at rest

• both moving and not moving objects

• no object