P3 0.0 / 5 ? SciencePhysicsGCSEOCR Created by: Lauraa01Created on: 27-12-13 09:28 What is the gradient on a distance - time graph? The gradient on a distance - time graph is the speed 1 of 37 When the gradient is steeper, what happens to the speed? The steeper the gradient, the higher the speed 2 of 37 How do you work out distance? Distance = average speed x time 3 of 37 How do you work out acceleration? Acceleration = change in speed / time 4 of 37 What is relative velocity? Relative velocity is the difference between the velocities of two bodies having regard to their direction 5 of 37 What is the area under a speed - time graph? The area under a speed - time graph is the distance travelled 6 of 37 What is the gradient on a speed - time graph? The gradient on a speed - time graph is the acceleration 7 of 37 What does a negative gradient mean? A negative gradient means the body is slowing down 8 of 37 What do forces always occur in? Forces always occur in pairs that are: the same size, act in opposite directions, act on different objects 9 of 37 What can forces do? Forces can make things speed up or slow down 10 of 37 How do you work out force? Force = mass x acceleration 11 of 37 How do you work out weight? Weight = mass x gravitational field strength 12 of 37 How do you work out the total stopping distance when a car stops? Total stopping distance = thinking distance + braking distance 13 of 37 What does thinking distance depend on? Thinking distance depends on the state of the driver and the speed of the vehicle (linear) 14 of 37 What does braking distance depend on? Braking distance depends on the state of the road, vehicle and speed (squared) 15 of 37 What do moving objects possess? Moving objects possess kinetic energy 16 of 37 How do you work out kinetic energy? KE = 1/2 mv2 17 of 37 What does fuel consumption depend on? Fuel consumption depends on the energy required to increase kinetic energy 18 of 37 What do roller coasters use as the source of movement? Roller coasters use gravitational potential energy as the source of movement 19 of 37 What happens to GPE (Gravitational potential energy) during a roller coaster ride? During a roller coaster ride, GPE is transferred into KE and back again 20 of 37 When is work done? Work is done when a force moves through a distance 21 of 37 What is power a measure of? Power (W) is a measure of how quickly work is done 22 of 37 How do you work out work done? Work done = force x distance 23 of 37 How do you work out power (related to rate at which work is done)? Power = work done / time 24 of 37 How do you out power (related to force and speed)? Power = force x speed 25 of 37 Name three safety features that a modern car has. Crumple zones, seat belts, air bags 26 of 37 How do you work out force (to do with cars)? Force = change in momentum / time 27 of 37 What can reduce injury? Spreading momentum change over a long period of time reduces injury 28 of 37 What do ABS breaks allow? ABS brakes mean the driver can keep control when breaking without skidding 29 of 37 What is terminal speed? Terminal speed is the maximum speed reached by a falling object 30 of 37 When does terminal speed happen? Terminal speed happens when the forces acting on the object are balanced 31 of 37 Why do falling objects get faster as they fall? Falling objects get faster as they fall because they are pulled towards the center of the earth by their weight 32 of 37 What is the same at any point on the Earths surface? The acceleration is the same at any point on the Earths surface 33 of 37 Two things that forces on a falling object depend on? The speed of the object (higher speed means more drag), the area of the object (larger area means more drag) 34 of 37 What happens to its kinetic energy when the car stops? When the car stops, its kinetic energy turns into heat in the brakes, tyres and road 35 of 37 Three things that affect reaction time (thinking distance)? Tired, under the influence of drugs or alcohol, travelling faster 36 of 37 Three things that affect braking distance? Poor road conditions, the car has not been properly maintained, the speed is increased 37 of 37
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