M4 - 2D Forces

Question 1

If turning through an angle of x

Answer 1

Cos x

Question 2

If turning away from angle x

Answer 2

Sin x

Question 3

On a table or slope, mass is in equilibrium where to the plane?

Answer 3

Perpendicular

Question 4

What is true parallel to the plane?

Answer 4

• Mass is in equilibrium if at rest
• Use F = ma is not at rest

Question 5

When does friction apply?

Answer 5

If surface is rough or not smooth

Question 6

What is µ?

Answer 6

Coefficient of friction

Question 7

What is the equation involving friction?

Answer 7

Fr ≤ µR

Question 8

How does the equation for friction change when in limiting equilibrium (or on point of moving)?

Answer 8

≤ changes to =