Section 1 - Mechanics Flashcards
1
Q
The Principle of Moments
A
The sum of the clockwise moments must equal that of the anti-clockwise moments.
2
Q
Equilibrium
A
I) the resultant force is zero
I I) the net moment about any point is zero
3
Q
Scalar
A
Quantity with magnitude only
4
Q
Density
A
p=m/v
5
Q
Centre of Gravity
A
The single point within a body at which the entire weight of the body may be considered to act.
6
Q
Moment (or torque)
A
The force x perpendicular distance from the point to the line of action of the force =fd
Unit: Nm
7
Q
Vector
A
A quantity with magnitude AND direction.
8
Q
Standard (SI) Units
A
F=ma -> kgm^-2
Pressure= Nm^-2 -> kgm^-1s^-2
Density = kgm^-3
ENERGY=J -> kgm^2s^-2
9
Q
How to increase the turning effect
A
Increase distance between pivot and weight
