# Phyics

everything

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## 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

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## 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

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## A Couple

A pair of equal and opposite forces separated by a distance

Density

The mass per unit volume ρ=m/V

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## 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

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## The Newton

The force required to accelerate 1kg to 1ms-1

Plastic deformation

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## Power

Rate at which work is done (Energy/Time)

Pressure

The normal force per unit cross sectional area   p=F/A

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## 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)

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## Scalar Quantity

A quantity with only magnitude

Special Theory of Relativity

The mass of an object increases as it approaches the speed of light

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## Speed

The rate of change of distance

Stopping Distance

Thinking distance + braking distance

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## Stress

The force per unit cross sectional area    stress=F/A

Strain

The deformation per unit of the original length    strain=x/L

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## Terminal Velocity

When an object no longer accelerates because the net force is 0, as FG due to gravity = Fd due to drag

Thinking distance

Distance travelled by the car in the time taken for the driver to react

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## Torque of a Couple

One of the forces x perpendicular distance between forces

Ultimate Tensile Strength

Breaking stress for a material

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## Vector Quantity

A quantity with both magnitude and direction

Velocity

The rate of change of displacement

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## 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

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Report

Newton is wrong, its The force required to accelerate 1kg to 1ms^-2

The Principle of moments is if an object is balanced then the sum of the clockwise moments about a pivot is equal to the sum of the anticlockwise moments about the same pivot

terminal velocity is not always when an object is falling, it is just when all the drag forces have balenced out the thrust forces

but otherwise its good  :)

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