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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

When the material does not return to original length/shape/size

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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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Comments

Mark Nash

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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