Friction and Energy Quiz

Which of the following helps in reducing friction?

• cloth, clay, rubber

• pebbles, rocks, mud

• gravel, sand, soil

• lubricants, rollers, wheels, and bearings

A boy is playing with a skateboard. In which surface will it travel the fastest?

• the carpet

• the polished floor

• the rough floor

• sandy ground

Which of the following is true about friction?

• Friction is not present in a smooth surface

• Friction slows down a moving object

• Smooth surface has more friction

• Objects move slowly on a rough surface

You rolled a marble on a very smooth surface. Without friction, what might happen to the marble?

• It will stop immediately.

• It will maintain its speed and suddenly stop.

• It will move either to the right or left side and stop.

• It will continuously move until it strikes another object.

Two balls were rolled at the same time on different surfaces with same force. Ball A rolls slowly on a rough surface and then eventually stopped while Ball B rolls on a smooth surface, rolled faster until it reached another object then slowly stopped. What do the statement imply?

• The balls have same speed even if the surface differ.

• Smooth surfaces produce less friction than rough surfaces.

• Smooth surfaces produce more friction than rough surfaces.

• The surface of an object has no effect on the movement of object.

Mother uses the pushcart when she goes to the groceries. What makes the pushcart advantageous to use?

• There is more friction between the floor and the pushcart.

• There is less friction between mother's shoes and the pushcart.

• The wheels reduce friction between the cart and the floor.

• The wheels of the cart increase friction between the floor and the cart.

You have noticed that your door hinges create a squeaky sound and hard to open. After applying some lubricants on it, the squeaky sound disappeared and made it easy to be opened. How do lubricants affect friction?

• Lubricants decrease friction and causes objects to move faster.

• Lubricants has no effect on the movement of objects.

• Lubricants increase friction and causes objects to move faster.

• Lubricants slows down the movement of objects.

Why is it easy to slip when there is water on a smooth surface that's why mother always tells us to keep our floor tiles dry to avoid accidents?

• The friction between your feet and the floor has no effect on your movement.

• The friction between your feet and the floor is increased by the water.

• The water increases the friction between your feet and the floor.

• The water is a lubricant and reduces the friction between your feet and the floor.

When you rolled your rubber ball on the grassy surface of the ground, it suddenly stops. How does friction affect the motion of the ball?

• Friction affects the ability of the ball to take more rolling.

• Friction decreases the time of the ball to take farther distance.

• Friction opposes the direction of the ball to change its direction.

• Friction slows down the rolling of the ball and prevents the ball to move farther.

While riding your bicycle, you have noticed that you move faster on a cemented road than on a bumpy road. Why?

• Friction is greater on a cemented road.

• Friction is lesser on a cemented road.

• There is no friction on a cemented road.

• The bicycle can roll only on a cemented road.