definitions (section 1) 0.0 / 5 ? PhysicsallIGCSEEdexcel Created by: phoebe_lhCreated on: 24-02-16 18:48 speed how fast you're going 1 of 37 velocity speed + direction 2 of 37 acceleration how quickly velocity is changing 3 of 37 gradient on DT graph is... speed 4 of 37 gradient on VT graph is... acceleration 5 of 37 flat on a DT graph is... stopped 6 of 37 curve on a VT graph is... changing acceleration 7 of 37 flat on a VT graph is... steady speed 8 of 37 gravity force of attraction between all masses 9 of 37 mass the amount of stuff in an object 10 of 37 weight caused by the pull of gravity (pulling to centre of earth) 11 of 37 units for weight newtons (N) 12 of 37 friction opposes movement and slows things down 13 of 37 3 types of friction 1. gripping solid surfaces 2. sliding solid surfaces 3. resistance from fluids 14 of 37 how to reduce friction lubrication, streamline 15 of 37 terminal velocity maximum speed a free falling object can reach 16 of 37 Newtons 1st Law if there is no resultant force, it will remain at a constant velocity or stationary 17 of 37 N2L if there is a resultant force, the object will accelerate in this direction 18 of 37 N3L to every force there is an equal and opposite force 19 of 37 vectors (examples) force, velocity, momentum, acceleration 20 of 37 scalar (examples) mass, temp, time, length 21 of 37 stopping distance the distanced travelled from first spotting the hazard to coming to a complete stop 22 of 37 thinking distance distance travelled between noticing hazard and applying brakes 23 of 37 braking distance distance travelled between application of brakes and car becoming stationary 24 of 37 factors affecting thinking distance speed, drugs, alcohol, age, tiredness 25 of 37 factors affecting braking distance speed, mass, brakes, road surface, weather, tyre tread 26 of 37 crumple zones crumple on impact increasing time taken to stop 27 of 37 conservation of momentum momentum is conserved when no external forces act 28 of 37 moment turning effect of a force 29 of 37 where does the centre of gravity hand directly below the point of suspension 30 of 37 principle of moments total anticlockwise moments = total clockwise moments 31 of 37 hooke's law says that... extension of an object is proportional to force 32 of 37 past the elastic limit material permanently stretched and will no longer return to its original shape 33 of 37 galaxy large collection of stars 34 of 37 universe large collection of billions of galaxies 35 of 37 what is responsible for keeping planets in orbit gravity and forward motion 36 of 37 when experiencing higher levels of gravity you are... closer to a star or planet 37 of 37
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