P3 4.0 / 5 based on 1 rating ? PhysicsP3GCSEOCR Created by: Ella Addison1Created on: 14-06-15 09:42 Speed How far something goes. measure speed we need the distance it went and time it took. an average speed is, initial speed + final speed/2 Acceleration how quickly speed changes 1 of 7 graphs distance-time graph, steeper slope=faster object moving distance-time graph, speed=gradient distance-time graph, curved line=object accelerating or decelerating. speed-time graph, flat line= steady speed speed-time graph, acceleration=gradient speed-time graph, area under line=distance travelled 2 of 7 Force velocity=speed including direction. push car, smaller mass+bigger force=bigger acceleration forces act in pairs- every action there is an equal and oppisite reaction 3 of 7 Stopping distance made up of two parts, thinking and braking. thinking, how far travelled whilst reacting, can be increased by drinking and tierdness. braking, how far travelled whilst car breaking,increased by worn tyers, slippery or icey roads. 4 of 7 Kinetic Energy Work, measure energy used. Power, how quickly energy is used. car stops, all work done by breaks=kinetic energy lost car= more fuel used if bigger engine or drive uphill or have to stop-start your journey. smaller fuel consumption in liters/100km further can drive on tank of petrol kenetic energy linked to speed^2, double speed braking distance quadrouples. crashes, kinetic energy in car=0 energy cant be made or destroyed but wasted through heat and sound. Rollercosters potentional gravitational energy at start= kinetic energy lost at end unless energy is lost. 5 of 7 Car saftey modern cars designed to absorb the energy through seatbelts, crumple zones and air bags. Car design aims to increase time for impact, reduces deceleration and force acting on you primary safty features prevent crash such as ABS, traction control secondary safty features, prevent with safty cage, crumple zone and paddle shift gears. passive safty features, consentrate, electric windows, cruise control, paddle shift gears. ABS=anti-locking braking system, controls wheel speed by computer stops skidding for shorter stopping distance. 6 of 7 Falling Weight=force by gravity 10 newtons for every kilogram on earth. All objects fall at same rate 10m/s^2 Terminal velocity= maximum speed falling object can go, where weight =air resistance reduce resistance by streamlining. 7 of 7
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