Question 1

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

Accepted Answer

Diver falling in the pool.

Answer

Rolling ball in a smooth surface.

Answer

Falling debris in a construction site.

Answer

Dropping water on the faucet.

Question 2

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

Accepted Answer

It always opposes motion.

Answer

It only exists when there is motion.

Answer

It is the same as kinetic friction.

Answer

It acts on the same direction.

Question 3

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

Accepted Answer

It is the least friction that keeps the book motionless.

Answer

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

Answer

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

Answer

It is the strongest friction that keeps the book motionless.

Question 4

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

Accepted Answer

heat

Answer

mass

Answer

gravity

Answer

volume

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

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

Answer

It only occurs between solid surfaces and liquid surfaces.

Answer

It occurs on one surface.

Question 6

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

Accepted Answer

gravity

Answer

volume

Answer

air resistance

Answer

friction

Question 7

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

Accepted Answer

It reduces speed of a moving vehicle.

Answer

It converts energy to heat and noise.

Answer

It allows you to grip things.

Answer

It helps in converting one form of motion into another.

Question 8

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

Accepted Answer

friction

Answer

mass

Answer

gravity

Answer

acceleration

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 lubricant?

Accepted Answer

alcohol

Answer

grease

Answer

oil

Answer

wax

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