Mechanics Definitions

Description

Physics (Mechanics) Flashcards on Mechanics Definitions, created by 10awalls on 24/03/2014.
10awalls
Flashcards by 10awalls, updated more than 1 year ago
10awalls
Created by 10awalls over 10 years ago
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Resource summary

Question Answer
Scalar A quantity with only magnitude
Vector A quantity with both magnitude and direction
Speed The rate of change of distance
Velocity The rate of change of displacement
Acceleration The rate of change of velocity
Terminal Velocity When an object no longer accelerates because its net force = 0
Braking Distance The distance travelled by the car between the time of the brakes being applied and the car stopping
Thinking Distance The distance travelled by the car in the time taken for the driver to react.
Stopping Distance Braking Distance + Thinking Distance
The Newton The force required to accelerate a mass of 1kg to 1ms-2
Principle of Moment Clockwise moment = Anticlockwise moment
Equilibrium Net force acting on the object must be zero, net moment about any point must also be zero
Centre of Gravity The point where an object’s entire weight appears to act
Couple A pair of equal and opposite forces separated by a distance
A torque of Couple One of the forces multiplied by the perpendicular distance between the forces
Density
Pressure
Stress
Strain
Young's Modulus
Hooke's Law The extension of a spring is directly proportional to the force applied to it (within the elastic region)
Elastic Limit The point after which a material does not return to its original form when stress is removed
Plastic Deformation When the material does not return to its original length/shape/size
Brittle Material Does not have a plastic region, breaks at elastic limit
Ultimate Tensile Strength force ×distance moved in direction of force
The Joule The work done moving 1N through 1m in the direction of the force
Power The rate at which work is done.
The Watt The transfer of energy of one joule per second
Principle of Conservation of Energy In a closed system energy cannot be created or destroyed
Special Theory of a Relativity The mass of an object increases as it approaches the speed of light
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