Friction and Force

Friction is a force that acts in a(n) ___________ direction relative to a moving object.

• similar

• opposite

• parallel

• perpendicular

What is friction?

• It is a resistance force

• Friction does not exist

• It is an imaginary force

• It is a force that moves objects at a constant speed

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How do you lower the friction force?

• By a smooth surface

• By a rough surface

• By not pushing hard

• By pushing down

What type of force helps slow down a moving car?

• normal force

• gravitational force

• electrical force

• frictional force

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How can friction be reduced?

• reduce the force acting between the 2 surfaces

• reduce the roughness of the 2 surfaces coming in contact

• use wax, grease or oil

• all of the above are ways of reducing friction

Which of the following is an example of friction that is helpful?

• Brakes used on a bike

• Tyres from a car on the road

• Tread on the bottom of your shoes

• All are examples that are helpful

What is the unit that measures force?

• Weight

• Gram

• Newton

• Kilogram

How would the absence of friction affect a marble travelling on a long, straight path?

• The marble’s speed would decrease.

• The marble’s speed would increase.

• The marble would stop immediately. 

• The marble would remain at a constant speed.

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If heavy objects are made to roll, _______friction comes into play.

• sliding friction

• rolling

• static friction

• kinetic friction

Which is not the advantage of friction?

• Friction helps in walking.

• Friction allows us to write on paper.

• Cars and buses move safely on roads due to friction.

• Friction causes wear and tear.