Topic 7 - Friction

Question 1

What is friction

Answer 1

Friction is a force that opposes the relative motion
between two surfaces in contact.

Question 2

What happens when 2 surfaces come in contact

Answer 2

the surface
roughness creates a resistance to motion.

Question 3

What is static friction

Answer 3

Static Friction is the force that opposes the initiation of
motion of a stationary object.

Question 4

what is kinetic friction

Answer 4

Kinetic Friction is the force that opposes the motion of
an object that is moving.

Question 5

what does the value of the coefficient of friction depend on

Answer 5

Combination of materials used for the surfaces.
Condition of the surfaces; dry/wet,
temperature etc.
Motion of the surfaces: static or moving.

Question 6

What is needed to initiate movement from rest than to continue the motion once sliding has started

Answer 6

A greater force

Question 7

Is the static coefficient of kinetic coefficient larger

Answer 7

static

Question 8

what is the coefficient of friction very sensitive to

Answer 8

the condition of the surface, so literature values represent only a rough guide.