aqa as physics – mechanics exam questions and answers

aqa as physics – mechanics exam questions and answers Weight - Answer- Mass x Gravitational Field Strength Vector - Answer- A quantity with size and direction Scalor - Answer- A quantity with size only Newton's 2nd Law - Answer- Resultant Force = mass x acceleration Displacement - Answer- Position of an object relative to an origin Average Speed - Answer- Distance Travelled / Time taken Instantaneous Speed - Answer- distance travelled in an instant / time duration of an instant Average Velocity - Answer- Change in displacement / time taken Velocity - Answer- Gradient of displacement / time graph Change in Displacement - Answer- Area under a velocity / time graph Acceleration - Answer- Rate of change in velocity Density - Answer- Mass / Volume Fluid - Answer- Gas or Liquid When the velocity reaches its greatest. - Answer- Terminal Velocity Viscous - Answer- a substance that is thick, sticky and resistive to flow Moment - Answer- Force x Perpendicular Distance from axis to line of action Principle of Moments - Answer- For an object in equilibrium, about any point, the sum of the clockwise moments = the sum of the anti-clockwise moments Centre of Gravity - Answer- The point at which the whole weight of the body appears to act Newton - Answer- Force needed to accelerate a 1kg mass by 1m/s² Torque - Answer- The same as a moment Couple - Answer- A pair of equal but opposite forces seperated by a perpendicular distance Change in Gravitational Potential Energy - Answer- mass x gravitational field strength x change in height Kinetic Energy - Answer- ½ x mass x velocity² Work Done - Answer- Force x Distance moved in the direction of the force Joule - Answer- The work done by a force of 1N in moving an object