Physics - Motion 0.0 / 5 PhysicsForces and MotionGCSEAQA Created by: lucidlemonsCreated on: 28-04-18 12:27 ACCELERATION. The amount by which speed increases in one second. 1 of 21 ATMOSPHERIC PRESSURE. Pressure caused by the collisions of air molecules that produce a force on an area. 2 of 21 AVERAGE SPEED. The total distance travelled in the total time taken for a complete journey 3 of 21 CENTRE OF GRAVITY. The point in an object where the force of gravity seems to act. 4 of 21 CENTRE OF MASS. The point in an object where the mass of an object seems to act. 5 of 21 COMPRESSED. Squashed into a smaller space. 6 of 21 DENSITY. The mass of a material in a certain volume. 7 of 21 DISTANCE-TIME GRAPH. A graph that shows how far an object moves each second. 8 of 21 GAS PRESSURE. The force exerted by air particles when they collide with a surface. 9 of 21 INCOMPRESSIBLE. Cannot be compressed (squashed). 10 of 21 INSTANTANEOUS SPEED. The speed at a particular moment. 11 of 21 LAW OF MOMENTS. An object is in equilibrium if the clockwise moments equal the anticlockwise moments. 12 of 21 LIQUID PRESSURE. The pressure produced by collisions of particles in a liquid. 13 of 21 METRES PER SECOND. (M/s). A unit of speed. 14 of 21 MOMENT. A measure of the ability of a force to rotate an object about a pivot. 15 of 21 NEWTON METRES. (Nm). The unit of moment. 16 of 21 NEWTONS PER METRE SQUARED. (N/m²). A unit of pressure. 17 of 21 PIVOT. The point about which a lever or see-saw balances. 18 of 21 PRESSURE. A force exerted on a certain area. 19 of 21 RELATIVE MOTION. The difference between the speeds of two moving objects, or of a moving and a stationary object. 20 of 21 SPEED. A measure of how far something travels in a given time. 21 of 21

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