Mechanics Definitions 4.0 / 5 based on 5 ratings ? PhysicsMechanicsASOCR Created by: Emma GrayCreated on: 19-05-14 18:03 Scalar and vector quantities Scalar has magnitude only, e.g. speed Vector has both magnitude and direction e.g. velocity 1 of 32 Displacement The distance moved in a stated direction 2 of 32 Speed The rate of change of distance 3 of 32 Instantaneous speed The gradient at a point on a DT graph 4 of 32 Average Speed total distance travelled/the total time taken 5 of 32 Velocity The rate of change of displacement 6 of 32 Acceleration The rate of change of velocity 7 of 32 The Newton The force required to accelerate 1kg by 1ms-2 8 of 32 center of gravity the point at which the entire weight of an object seems to act 9 of 32 the moment of a force force x perpendicular distance between the pivot and force 10 of 32 torque of a couple one force x the perpendicular distance between the forces 11 of 32 Stress force/cross-sectional area 12 of 32 strain extension/origional length 13 of 32 young modulus stress/strain (as long as the young modulus is not exceeded) 14 of 32 brittle only behaves elastically / it breaks at its elastic limit 15 of 32 Ultimate tensile strength the maximum stress that can be applied to an object before it breaks 16 of 32 work done by a force force x distance moved in the direction of the force 17 of 32 elastic deformation when the load is removed the material will return to its original shape/length 18 of 32 plastic deformation when the load is removed the material will not return to its original shape (it has been permanently deformed) 19 of 32 elastic limit the maximum load that can be applied to an object so that it will regain its original length once the load is removed 20 of 32 spring constant where hookes law is obeyed. force per unit extension 21 of 32 the joule when a force of 1N moves 1m in the direction of the force the work done is 1J 22 of 32 power the rate of work done 23 of 32 the watt one watt is one joule per second 24 of 32 pressure force/area 25 of 32 density mass/volume 26 of 32 Thinking distance the distance travelled from seeing the reason to brake and applying the brakes 27 of 32 Braking distance the distance travelled by the car whilst decellerating to a stop 28 of 32 Stopping distance thinking distance + braking distance 29 of 32 principle of moments for equilibrium the sum of the clockwise moments about a pivot is equal to the sum of the anticlockwise moments around the same pivot 30 of 32 conditions for an object to be in equilibrium net force and net moment to equal 0 31 of 32 hookes law force is directly proportional to extension as long as the eastic limit is not exceeded 32 of 32
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