Reviewer in Science (Third Quarter)

How is brake useful?

• It uses friction to move vehicles easily.

• It uses friction to move the vehicle to any direction.

• It uses friction to slow down moving vehicles.

• It uses friction to make vehicles move faster.

Which of the following statements does NOT tell about the effects of gravitational force on objects?

• The more distant the body from the earth, the lesser is the gravitational force of attraction.

• Gravitational force pushes the objects upward.

• Gravitational force is greater when the objects are closer together.

• The farther you are from earth, the less your weight.

When you push both wooden block and metal block of the same size, with the same force, which block do you think will move faster?

• The wooden block because it has rough texture.

• The metal block because it has smooth texture.

• It will both move with the same speed.

• Both A and B

Why is it more difficult for us to go up a mountain than go down?

• We are moving against gravity.

• We are moving towards gravity.

• We are pulled by the wind.

• None of the above

Which of the following activities does not shows static friction?

• Roi is riding on a skateboard going to the plaza.

• Two men push on stalled car that does not move.

• A mother tries to push a heavy bed which remains in position.

• Push the table that does not move.

When you push a heavy box across the floor, what force makes it harder to start moving?

• Gravity

• Air Resistance

• Static friction

• Magnetism

Why do need to put rollers under the cabinets when you want to move them to overcome static friction?

• To apply more force.

• To stop the movement of the cabinet.

• To slow down the movement of the cabinet.

• To minimize friction through the small surface of contact of the rollers.

The following statement describe kinetic friction, except one.

• It is a frictional force caused by molecular adhesion between the two surfaces that are rubbed against each other.

• It acts opposite to the motion of an object.

• Kinetic friction is the force that acts between two surfaces when they are sliding past each other.

• It is a force that makes it a bit harder to keep things moving.

Kinetic friction is present between surfaces that are in contact with each other. How kinetic friction will NOT possible on the following?

• newly polished floor

• wet floor

• rough surface

• powderized or dusty floor

When you ride a bike, what causes you to slow down if you stop pedaling?

• Static friction

• Gravity

• Kinetic Friction

• Inertia