forces Flashcards
1
Q
hooke’s law
A
restoring force is directly proportional to the extension in a material if its limit of proportionality is not exceeded
2
Q
pressure
A
force per unit area, where the force is acting at right angles to the area
3
Q
density
A
mass per unit volume of a substance
4
Q
centre of gravity
A
point at which the whole weight of a body may be thought to act
5
Q
moment
A
product of the force and the perpendicular distance of the line of action of the force from the pivot
6
Q
torque
A
product of one of the forces and the perpendicular distance between the lines of action of the forces
7
Q
principle of moments
A
if a body is in equilibrium, the sum of all the clockwise moments about any axis must equal the sum of all the anticlockwise moments about the same axis
