Third Periodical Test in Science 6

Which of the following statements about friction is TRUE?

• A.    Friction opposes motion of objects.

• B.    Friction occurs between non-rubbing surfaces.

• C.    Friction causes moving objects to move faster.

• D.    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 a tiled floor?

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

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

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

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

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

• A.    If the floor is wet

• B.    If the floor is tiled

• C.    If the floor is rough

• D.    If the floor is smooth

 

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

• A. Friction  

• B. Gravity

• C. magnetic

• D. motion

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

• A. rough surface is slippery

• B. there is no friction on a rough surface

• C. there is lesser friction on a rough surface

• D. there is greater friction on a rough surface

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

• A. It increases friction.

• B. It decreases friction.

• C. It maintains friction.

• D. It increases and decreases friction.

Which of the following forces cause objects to slow down and eventually stop?

• A. air resistance

• B. friction

• C. gravity

• D. magnetic

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

• A. toward the direction of object’s motion

• B. similar to the direction of object’s motion

• C. opposite to the direction of object’s motion

• D. perpendicular to the direction of object’s motion

Which activity below needs the least friction?

• A. grinding

• B. skating

• C. climbing

• D. writing

Which activity is a way of reducing friction?

• A. applying lubricant

• B. using rubber shoes

• C. putting spikes on tires

• D. removing wheels on heavy cabinets