Question 1

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

accellaration

Answer

gravity

Question 2

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

Accepted Answer

The least friction that keeps the book motionless.

Answer

The strongest friction that keeps the book motionless.

Answer

The least friction that keeps the book in motion.

Answer

The strongest friction that keeps the book in motion.

Question 3

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

Accepted Answer

Rolling ball in a smooth surface

Answer

Falling debris in a construction site.

Answer

Dropping water on the faucet.

Answer

Diver falling in the pool.

Question 4

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 5

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

Accepted Answer

Alcohol

Answer

Oil

Answer

Grease

Question 6

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

Accepted Answer

It helps in converting one form of motion into another

Answer

It reduces speed of a moving vehicle.

Answer

It allows you to grip things.

Answer

It converts energy to heat and noise.

Question 7

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 pulls all objects towards the center of the Earth.

Answer

It is only present if the gravity is also present.

Answer

It does not affect motion of an object

Question 8

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

Accepted Answer

It always opposes motion.

Answer

It is the same as kinetic friction.

Answer

It acts on the same direction.

Answer

It only exists when there is motion.

Question 9

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

Accepted Answer

heat

Answer

gravity

Answer

volume

Answer

mass

Question 10

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

Accepted Answer

friction

Answer

volume

Answer

air resistance

Answer

gravity

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