Unit 1- Equilibrium, Work And Power Flashcards
1
Q
Power
A
Power = work done / time
2
Q
The principle of conservation of energy
A
The total energy of a closed system remains constant
3
Q
Conditions for equilibrium
A
- Net force = 0
2. Net moment = 0
4
Q
Couple
A
A pair of equal and opposite forces (with their lines of action separated by a distance)
5
Q
Moment of a force
A
Moment = force x perpendicular distance from a point
6
Q
The principle of moments
A
For equilibrium of an object the sum of clockwise moments about a point = sum of anti-clockwise moments about the same point
7
Q
Torque of a couple
A
One of the forces x perpendicular distance between forces
8
Q
Pressure
A
Force / area
9
Q
Density
A
Mass / volume
10
Q
Centre of gravity
A
The point where the weight appears to act
11
Q
Work done by a force
A
Work done = force x distance moved in the direction of the force
