Question 1

Friction is present in our everyday lives. Which of the following situations   involves friction?

Accepted Answer

Rolling ball in a smooth surface.

Answer

Diver falling in the pool.

Answer

Dropping water on the faucet.

Answer

Falling debris in a construction site.

Question 2

Friction can be seen everywhere. Which of the following statements is true about   friction?

Accepted Answer

It always opposes motion.

Answer

It acts on the same direction

Answer

It is the same as kinetic friction.

Answer

It only exists when there is motion.

Question 3

A book on top of the table shows static friction. What do you think is static friction?

Accepted Answer

It is the strongest friction that keeps the book motionless.

Answer

It is the least friction that keeps the book motionless.

Answer

It is the strongest friction that keeps the book in motion.

Answer

It is the least friction that keeps the book in motion.

Question 4

Rubbing your hands show frictional force. What do you create when you rub your hands?

Accepted Answer

heat

Answer

volume

Answer

gravity

Answer

mass

Question 5

It will be difficult if there is no friction. Which of the following sentences best describes frictional force?

Accepted Answer

It occurs when two surfaces touch against each other.

Answer

t only occurs between solid surfaces and liquid surfaces.

Answer

It occur on one surface.

Answer

It occurs when two surfaces do not touch against each other.

Question 6

A child accidentally slides on a wet floor. What causes the child to slide on the floor?

Accepted Answer

friction

Answer

gravity

Answer

volume

Answer

air resistance

Question 7

The effect of friction can be desirable or undesirable. Which of the following is undesirable?

Accepted Answer

It converts energy to heat and noise.

Answer

It helps in converting one form of motion into another.

Answer

It allows to grip things.

Answer

It reduces speed of a moving vehicle

Question 8

Force is a push or pull that acts on an objects. Which of the following is a force that opposes motion?

Accepted Answer

friction

Answer

gravity

Answer

acceleration

Answer

mass

Question 9

Friction plays an important role in your life. Which of the following statements is true?

Accepted Answer

It slows down or stops objects in motion.

Answer

It is only present if gravity is also present.

Answer

It does not affect the motion of an object.

Answer

It pulls all objects towards the center of the Earth.

Question 10

To increase machine effectiveness, you apply lubricants. Which of the following cannot be used as lubricants?

Accepted Answer

alcohol

Answer

wax

Answer

grease

Answer

oil

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