Friction

Friction is a...

• Type of movement

• Form of energy

• Colour

• Force

Friction always acts in the opposite direction to...

• The direction the object is moving

• The direction of energy flow

• The right

• The left

Friction transfers an object's kinetic energy into...

• Sound

• Heat

• Light

• Electricity

Friction always acts...

• On one object only

• Between two or more objects

• Separately to objects - it's a non contact force

• Where objects touch - it's a contact force

Friction changes an object's speed by...

• Slowing it down

• Maintaining its speed

• Speeding it up

If you increase the surface area where objects rub together, the friction force will be...

• Increased

• Maintained

• Decreased

Which of these will reduce friction between two surfaces?

• Roughen the surfaces

• Polish the surfaces

• Lubricate the surfaces

• Dry the surfaces

Where should friction be minimised?

• The wheel bearings of a bike

• The soles of shoes

• The moving parts of a car engine

• The brakes of a car

Where should friction be maximised?

• The wheel bearings of a bike

• The soles of shoes

• The moving parts of a car engine

• The brakes of a car

Which force is a type of friction?

• Weight

• Lift

• Drag

• Reaction