Chapter 4 Moments Flashcards
1
Q
The moment of a force..
A
measures the turning effect of the force on a rigid body
2
Q
Moment of a force =
A
Force x Perpendicular Distance
3
Q
Opposite
A
Sinß
4
Q
Adjacent
A
Cosß
5
Q
Resultant moment is..
A
the sum of the individual moments
6
Q
A rigid body is in equilibrium if…
A
- Resultant force vertically is equal to zero
- Sum of clockwise moments = sum of anticlockwise moments
7
Q
Equilibrium means the body…
A
is not moving
8
Q
Uniform Body
A
The weight of the body acts at the centre
9
Q
Weight formula
A
W = mg
10
Q
A non-uniform body
A
The centre of mass is not necessarily at the midpoint
11
Q
Steps for a NORMAL MOMENT QUESTION
A
- Resolve vertically
- Take moments about smartest spot
12
Q
If tilting about A
A
Reaction force of B = 0
13
Q
If tilting about B
A
Reaction force of A = 0
