Mechanics Definitions 0.0 / 5 ? PhysicsMomentum and ImpulseMotionForcesA2/A-levelAQA Created by: Steph.SCreated on: 08-02-17 10:11 Scalar A quantity with magnitude but no direction e.g. speed, density, mass, 1 of 18 Vector A quantity with magnitude and direction e.g.displacement, acceleration, force 2 of 18 Displacement (s) The distance travelled in a particular direction 3 of 18 Speed The rate of change of distance 4 of 18 Velocity (u,v) rate of change of displacement 5 of 18 Acceleration (a) rate of change of velocity 6 of 18 Newton's 1st A body will remain at rest or at constant velocity unless acted upon by a force 7 of 18 Newton's 2nd The resultant force acting on an object is directly proportional to the rate of change of momentum 8 of 18 Newton's 3rd When a force is exerted on a body, the body 9 of 18 Linear Momentum (ρ) Mass x Velocity (velocity) 10 of 18 Conservation of Linear Momentum Total momentum is constant/conserved for closed systems/provided no external forces 11 of 18 Impulse of a force (J) Force x time the force acts for 12 of 18 Perfectly Elastic Collision A collision in which momentum and kinetic energy is conserved 13 of 18 Inelastic Collision A collision in which momentum is conserved and kinetic energy is not 14 of 18 Density (ρ) mass/volume, mass per unit volume 15 of 18 Pressure (Pa) force/area, force per unit area 16 of 18 Centre of Mass The point in a body around which mass is equally distributed 17 of 18 Couple A pair of equal and opposite co-planar forces 18 of 18
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