Friction and forces

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

• similar
• opposite
• parallel
• perpendicular

 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.

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

How do you lower the friction force?

• By a smooth surface
• By a rough surface
• By not pushing hard
• By pushing down

Q3. If heavy objects are made to roll, _______friction comes into play.

• sliding friction

• rolling

• static friction

• kinetic friction

Q4. 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.

Q8. Tyres of vehicles have grooved designs to

• reduce friction

• increase friction

Q12. Friction can be increased by increasing the ________of the surfaces in contact.

• Smoothness

• Area

• Roughness

• None of the above

What surface would have the most friction?

• Glass
• Marble
• Pool table
• Sandpaper