OCR AS Mechanics Definitions 0.0 / 5 ? PhysicsMechanics DefinitionsASOCR Created by: googleyberryCreated on: 18-03-15 11:27 Acceleration Acceleration is the rate in change of velocity 1 of 29 Braking Distance Braking distance is the distance travelled between applying pressure to the brakes and the car stopping 2 of 29 A Brittle Material A material that has no plastic region, and breaks at an elastic limit 3 of 29 Centre of gravity The pount where and objects entire force acts 4 of 29 A couple A pair of equal and opposite forces seperated by a distance 5 of 29 Density The mass per unit volume 6 of 29 Elastic Limit The point after which a material does not return to its origional shape after the applied force is removed 7 of 29 Equillibrium The net force acting on the object is 0. 8 of 29 State Hooke's Law The extension of a spring is directly proportional to the force applied to it. 9 of 29 the Newton The force required to accelerate a 1km mass to 1ms 10 of 29 Plastic Deformation This is when the material doesnt return to its origional length/shape 11 of 29 Power The rate at which work is done 12 of 29 Pressure The force per unit cross sectional area 13 of 29 Principle of Conservation of Energy Energy cannot be created or destroyed, only transformed 14 of 29 Principle of a moment The clockwise moments = anticlockwise moments 15 of 29 Scalar Quantity A quanitity with only magnitude 16 of 29 Special Theory of Relativity The mass of an object increases as it approaches the speed of light 17 of 29 Speed The rate in change of distance 18 of 29 Stopping Distance Thinking distance + Braking Distance 19 of 29 Stress The deformation per unit of the origional length 20 of 29 Terminal Velocity The maximum velocity that an object will experience in free-fall, as its weight is equal to the drag 21 of 29 Thinking Distance The distance travelled by the car between seeing an obstacle and pressing the brake 22 of 29 Torque of a Couple One of the forces x the perpendicular distance between the forces 23 of 29 Ultimate Tensile Strength The breaking stress for a material 24 of 29 Vector A quanitity with both magnitude and direction 25 of 29 Velocity The rate in change of displacement 26 of 29 The Watt The transfer of energy of one joule per second 27 of 29 Word done by a force Force x distance travelled in the direction of the force 28 of 29 Young's Modulus Stress/Strain 29 of 29
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