4. Resolving Forces Flashcards
1
Q
Lami’s Theorem
A
- For any set of three forces P,Q and R in equilibrium
- P / sin α = Q / sin β = R / sin γ
2
Q
Methods of working out forces in equilibrium
A
- Construct a triangle and work out forces
- Resolve forces in x and y directions; sum of each = 0
3
Q
Forces in equilibrium
A
resultant = 0
4
Q
If force F makes an angle θ with a given direction, the
effect of the force in that direction is F cos θ
A
- F cos(90 − θ) = F sin θ
- F sin (90 − θ) = F cos θ
