Friction

What are the different types of friction?

• Smooth friction, rough friction, bumpy friction, and sharp friction

• Static friction, kinetic friction, rolling friction, and fluid friction

• Hard friction, soft friction, solid friction, and liquid friction

• Fast friction, slow friction, medium friction, and high friction

Explain the difference between static friction and kinetic friction.

• Static friction and kinetic friction are the same thing and can be used interchangeably.

• Static friction is stronger than kinetic friction, while kinetic friction is stronger than static friction.

• Static friction occurs when two surfaces are not moving relative to each other, while kinetic friction occurs when two surfaces are sliding past each other.

• Static friction occurs when two surfaces are moving relative to each other, while kinetic friction occurs when two surfaces are not moving.

How is static friction different from kinetic friction?

• Static friction occurs when an object is in motion, while kinetic friction occurs when an object is at rest.

• Static friction only occurs on rough surfaces, while kinetic friction only occurs on smooth surfaces.

• Static friction and kinetic friction are the same thing.

• Static friction occurs when an object is at rest, while kinetic friction occurs when an object is in motion.

Calculate the frictional force when the coefficient of friction is 0.5 and the normal force is 100N.

• 75N

• 200N

• 50N

• 25N

What factors affect static friction?

• Shape, size, smell

• Nature of surfaces, normal force, interlocking

• Weight, speed, texture

• Temperature, velocity, color

Calculate the maximum frictional force when the coefficient of friction is 0.4 and the normal force is 150N.

• 60N

• 200N

• 30N

• 100N

What is the formula to calculate frictional force?

• Frictional force = distance ÷ time

• Frictional force = mass × acceleration

• Frictional force = coefficient of friction × normal force

• Frictional force = work ÷ time

What is the relationship between normal force and frictional force?

• There is no relationship between normal force and frictional force

• Frictional force is directly proportional to normal force

• Frictional force is inversely proportional to normal force

• Frictional force is equal to normal force