Friction Force

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

• similar
• opposite
• parallel
• perpendicular

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

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

What type of force helps slow down a moving car?

• normal force

• gravitational force

• electrical force

• frictional force

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed
• less friction doesn't affect speed

The force that acts in the opposite direction of motion when two surfaces come in contact. 

• Force
• Friction
• Static
• Kinetic