Friction

Which of the following statements about friction is TRUE?

• Friction opposes motion of objects.

• Friction occurs between non-rubbing surfaces.

• Friction causes moving objects to move faster.

• Friction acts in a direction similar to the direction of an object’s motion.

Will it be easier for a person to push a table on a carpeted floor than on tiled floor?

• No, because the carpeted floor is rough, so friction is lesser.

• No, because the carpeted floor is rough, so friction is greater.

• Yes, because the carpeted floor is smooth, so friction is lesser.

• Yes, because the carpeted floor is smooth, so friction is greater.

When can we say that friction on a floor is greater?

• If the floor is wet.

• If the floor is tiled.

• If the floor is rough.

• If the floor is smooth.

Which force causes a rolling ball to stop after a few seconds?

• friction

• gravity

• magnetic

• motion

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Why is difficult to move heavy objects on a rough surface?

• rough surface is slippery

• there is no friction on a rough surface

• there is lesser friction on a rough surface

• there is greater friction on a rough surface

When you are travelling along a road, how does the wet road affect friction?

• It increases friction.

• It decreases friction.

• It maintains friction.

• It increases and decreases friction.

Which of the following forces causes objects to slowdown and eventually stop?

• air resistance

• friction

• gravity

• magnetic

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What is the direction of friction between a moving object and a surface?

• toward the direction of object’s motion

• similar to the direction of object’s motion

• opposite to the direction of object’s motion

• perpendicular to the direction of object’s motion.

Which activity below needs least friction?

• grinding

• skating

• climbing

• writing

Which activity is a way of reducing friction?

• applying lubricant

• using rubber shoes

• putting spikes on tires

• removing wheels on heavy cabinets