Friction and Gravity by Teacher Pierre

Study the diagram, which force does B represent?

• A. friction

• B. gravity

• C. magnetic

• D. motion

A bicycle moves faster on a cemented road than on a bumpy road. Why?

• A. Friction is greater on a cemented road.

• B. Friction is lesser on a cemented road.

• C. There is no friction on a cemented road.

• D. The bicycle can roll only on a cemented road.

Which of the following statements best describes friction?

• A. It is a force that occurs when surfaces touch each other.

• B. It is a force that occurs between solids and liquids.

• C. It is a force that occurs only on rough surfaces.

• D. It is a force that occurs between solids.

The boy in the illustration pulls a stroller. Using the directions shown, which direction does the frictional force act?

• A. East

• B. North

• C. South

• D. West

Which of the following statements describe friction?

• A. It slows down motion.

• B. It pulls objects downward.

• C. It does not oppose motion.

• D. It moves along with the object.

Which shows that Friction is undesirable?

• A. Pushing furniture

• B. Lightning a matchstick

• C. Walking on wet floors

• D. Approaching a stoplight

Which of the following statements is TRUE?

• A. Friction makes objects move.

• B. Friction stops moving objects.

• C. Friction has no effect on moving objects.

• D. Friction allows moving objects to continue moving.

Why do drivers drive their car slowly during rainy days?

• A. Drivers drive slowly because the windshield is blurred.

• B. Drivers drive slowly because they are afraid of the rain.

• C. Drivers drive slowly because the road is wet so there is less friction.

• D. Drivers drive slowly because the road is wet so there is more friction.

Why can't a ball roll continuously on a rough surface?

• A. The rough surfaces are not made for the balls to roll.

• B. The force which enables the ball to move is released.

• C. The rough texture of the surface blocks the movement of the ball.

• D. The rough texture of the surface permits the movement of the ball.

Why do badminton players use rubber shoes while playing?

• A. to slide since the badminton court is slippery.

• B. to glide faster since the badminton court is slippery.

• C. to have lesser friction between their shoes and the floor.

• D. to have greater friction between their shoes and the floor.