Physics Definitions 0.0 / 5 ? PhysicsWhole Physics AS CourseASOCR Created by: meganjane30Created on: 06-06-17 17:34 Speed How fast something is moving regardless of direction 1 of 32 Displacement (s) How far an object's travelled from its starting point in a given distance 2 of 32 Velocity (v) The rate of change of an objects speed & displacement in a given direction 3 of 32 Aceleration (a) The rate of change of a objects velocity 4 of 32 Free Fall The motion of an object undergoing the acceleration of 'g' ( 9.81 ) 5 of 32 Force F=ma 6 of 32 Weight W=mg 7 of 32 A Vector Quantity It has a magintude & a direction 8 of 32 A Scalar Quantity It has a magnitude only 9 of 32 Trapezium rule 1/2 x width of ***** x ( 1st ***** height + 2( sum of all the middle heights ) + last ***** height ) 10 of 32 Instantaneous Speed It is the speed/velocity of an object over a very short interal of time 11 of 32 Gravity it is 9.81 and mass has no effect on the acceleration of and object falling due to gravity 12 of 32 Terminal Velocity When the averave velocity of a falling object remains constant, The dirving force equals the resultant force and the net force = 0 13 of 32 Center of Mass It is an imaginary point where the entire weight of an object appears to act 14 of 32 Moment It is a turning force on an object & this force acts around a fulcrum 15 of 32 Principle of moments The sum of clockwise moments = the sum of anticlockwise moments 16 of 32 Couple It is a pair of forces of equal sizes which act parallel to eachother but in oppoite directions 17 of 32 Torque Size of one of the forces x perpendicular distance between the forces 18 of 32 Density The mass per unit volume of a substance * it isnt affected by size or shape, just the material its made from 19 of 32 Pressure The force on a given area 20 of 32 Pressure in fluids Both gases and liquids are fluids because they both exert pressure on to a surface due to constant bombardment by their molecules on that surface 21 of 32 Archimedes Principle The upthrust exerted on a body is equal to the weight of the fluid the body displaces 22 of 32 Upthrust The difference in pressure between the top & bottom of the object which causes an overall upwards force 23 of 32 Work Done work done = energy transferred ( because energy is defined as the capacity to do work ) 24 of 32 9 Types of Energy Kinetic, Gravitational Potentiall, Elastic Potentiall, Nuclear, Sound, Thermal ( internal ), Electrical, Radiant, Chemical 25 of 32 Conservation of Energy The total energy in a closed system remains constant as energy can never be created of destroyed & it can be transferred from form to form 26 of 32 Power Rate of work done = Rate of energy transferred 27 of 32 Efficency Usefull energy out/Total input energy x 100 28 of 32 Hookes Law The extension of the spring is directly proportional to the force applies ( this is true as long as the elastic limit is not exceeded ) 29 of 32 Elastic Deformation It obeys Hooke's law, energy is recoverable, it returns to it's origional length 30 of 32 Elastic Limit up to this point Force is directly proportional to Extension but beyond this point a material will deform plastically 31 of 32 Plastic Deformation It does noy obey Hooke's law, energy is not recoverable, it will not return to its origional length 32 of 32

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