Moments Flashcards
1
Q
How do you calculate a moment
A
Magnitude of force X perpendicular distance from pivot
2
Q
Is anti clockwise or clockwise negetive or positive
A
Anti clockwise is positive
Clockwise is negetive
3
Q
What is the result of a Plank being in equilibrium
A
Resultant force is 0
Moment about any pivot is 0
4
Q
What is meant by at tipping point
A
It’s about to tip
Pivot which it is not pivoting about has a reaction force of 0
5
Q
What forces might you need to take into account using planks
A
Reaction force of pivots
Weight of objects and plank
Tension in strings (acting up)
6
Q
What’s the difference between a uniform and non uniform plank
A
Uniform= gravity acts on centre of plank
Non-uniform= weight acts elsewhere
7
Q
What’s is a lámina
A
Plane área with mass but negliable thickness (square)
