3. How can you best describe friction between the bottom or feet of the furniture and the floor?

A. By smoothing the floor

B. By keeping furniture on their place

C. By applying lubricants like wax on the floor

D. By putting wheels or rollers on the bottom or feet of the floor

4. Which shows that friction is undesirable?

A. Pushing furniture

B. Lighting a matchstick

C. walking on wet floor

D. using brakes when
approaching a stop light

5. A boy sits on a grassy slope. What force stops him from sliding down?

A. Friction

B. Weight

C. gravity

D. magnetic​