22 terms

Mechanics 1

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Torque
Torque = force x perpendicular distance between forces
Couple
Two parallel forces of equal magnitude acting in opposite directions
Moment =
Force x Perpendicular Distance from fulcrum
Newtons law of gravitation
Force of attraction of 2 bodies is proportional to product of masses and inversely proportional to the distance squared between the centre of the bodies
Boyle's Law
For a fixed mass of gas at constant temperature the pressure of the gas is inversely proportional to the volume of the gas
Law of Floatation
The weight of a floating body is equal to the weight of fluid it displaced
Archimedes Principle
When a body is partially or wholly immersed in a liquid the upthrust is equal to weight of fluid it displaces
Pressure =
Force / Area
Pressure in a liquid =
(Density)x(gravity)x(depth)
Newton's First Law
A body will move at constant velocity unless a force acts on it
Newton's Second Law
The rate of change of momentum of an object is proportional to the force creating the change and takes place in the same direction as the force
Newton's Third Law
If A exerts a force on B then B exerts an equal but opposite force on A
Acceleration
Rate of change of velocity with respect to time
Velocity
Rate of change of displacement with respect to time
Displacement
Distance in a given direction
Work =
Force x Displacement
Energy
The ability to do work
Principal of conservation of energy
Energy cannot be created or destroyed. It can only be changed from one form to another
Power =
Work / time
Percentage Efficiency =
(Energy out / Energy In) x 100
Kinetic Energy =
1/2 (mass)x(velocity squared)
Potential Energy
Mass x gravity x height