Mechanics Definitions: OCR AS Physics A

A collection of all of the definitions needed for the mechanics paper, taken from all of the available past papers and some textbooks too.

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Mechanics
Acceleration
Rate of change of velocity a=(v-u)/t
Braking Distance
Distance travelled by the car between the time of the brakes being applied
and the car stopping
Brittle Material
Does not have a plastic region, breaks at elastic limit
Centre of Gravity
The point where an object's entire weight appears to act
A Couple
A pair of equal and opposite forces separated by a distance
Density
The mass per unit volume =m/V
Elastic Limit
The point after which a material does not return to its original form when
stress is removed
Equilibrium
Net force acting on the object must be 0, net moment about any point must
also be zero
Hooke's Law
The extension of a spring is directly proportional to the force applied to it
(within elastic region)
The Joule
The work done moving 1N through 1m in the direction of the force
The Newton
The force required to accelerate 1kg to 1ms-1
Plastic deformation

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When the material does not return to original length/shape/size
Power
Rate at which work is done (Energy/Time)
Pressure
The normal force per unit cross sectional area p=F/A
Principle of Conservation of Energy
Energy cannot be created or destroyed, only transformed into other forms
Principle of Moments
Clockwise moments = anticlockwise moments (around a point)
Scalar Quantity
A quantity with only magnitude
Special Theory of Relativity
The mass of an object increases as it approaches the speed of light
Speed
The rate of change of distance…read more

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Ultimate Tensile Strength
Breaking stress for a material
Vector Quantity
A quantity with both magnitude and direction
Velocity
The rate of change of displacement
The Watt
The transfer of energy of one joule per second
Work Done by a Force
Force x distance travelled in direction of force
Young's Modulus
Stress/strain (within the elastic region) E=FL/Ax…read more

Comments

School Aside

Awesome, thank you!

Maida

Thank you very much. there are still more definitions but its still good.

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