The Incline Plane

Question 1

Describe the incline plane.

Answer 1

mg sin angle 1 = forward force (Ff)
mg cos angle 1 = normal force (R)

Equilibrium:
No net force in any direction
No net moment about any point

mg sin angle 1 / mg cos angle 1 = Ff / R

tan angle 1 = Ff / R
Therefore Ff = R tan angle 1

Tan angle 1 is called the coefficient of friction (u)
Ff = uR
u = tan 30

Question 2

Define centre of mass.

Answer 2

A point where the mass of an object seems to be concentrated.

Question 3

Define centre of gravity.

Answer 3

A point where gravity seems to act.