Aplication Of Forces Flashcards
Hookes law
The extension of a spring is directly proportional to the force applied, provided the limits of proportionality is not exceeded
The principal of moments
When a body is in equilibrium the sum of the clockwise moments about any point equals the sum of the anti-clockwise moments about the same point.
What is resultant force
Overall of total force acting on an object
Equation of spring constant
F=ke
Equation of the principle of moments
ACWM=CWM
Fd=Fd
What two conditions must be true for equilibrium
Clockwise moment about pivot= ACWM about the pivot
There must be no resultant or unbalanced force in any direction
What is a reaction force
A force which acts in the opposite direction to ALL forces
What is the centre of gravity
One point where the total weight of the body appears to act
What is the centre of mass
The point where its total mass appears to act
What factors affect the stability of an object
A low centre of gravity (by having a heavy base)
A wide base - to prevent toppling
What is pressure
Pressure is when a force is exerted on an object
Equation for pressure
P=F/A
Units of pressure
Pascals (Pa)
N/cm2
N/mm2
