Physics 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: 08chandjesCreated on: 12-12-17 10:09 What are 5 scalar quantities? speed,mass,distance, time, energy 1 of 19 Name 7 Vector quantities? velocity, displacement, acceleration, force, momentum, current and voltage. 2 of 19 What is the difference between scalar quantities and vector quantities? vector quantities have both a size and a direction but scalar quantities only have a size 3 of 19 What is weight? Weight is a force measured in newtons. 4 of 19 1N =.... 100g on earth 5 of 19 What is the equation for GPE (gravitational potential energy)? GPE = m x g x h (mass in kg and height in metres) 6 of 19 What is the equation for KE (kinetic energy) ? KE = 1/2 x m x v² 7 of 19 What is the equation for momentum? momentum = mass x velocity (kgms-1 = kg x ms -1) ( P = M x V) 8 of 19 Explain the laws of conservation of momentum. The law of conservation of momentum states that the momentum before the moment of impact ( collision) will always be equal to the momentum after. 9 of 19 What is the equation for stopping distance? Stopping distance = thinking distance + braking distance 10 of 19 What is stopping distance? the distance travelled between the time when someone decides to stop a vehicle moving, and the time when the vehicle completely stops 11 of 19 What is the thinking distance? The thinking distance is the distance travelled in between the driver realising he needs to brake and actually braking. 12 of 19 What is the braking distance? The braking distance is the distance taken to stop once the brakes are applied. 13 of 19 What are 4 features of a car that reduce the effects of a crash? Crumple zone, anti locking braking system (ABS), traction control and saftey cage 14 of 19 What is work? Work is useful energy transfer. 15 of 19 What is the equation to work out the amount of work done? Work (J) = force(N) x distance (M) 16 of 19 If runners run around a 400m track what is their displacement? 0 because they ended up the same place they started and displacement is how far you have travelled from a certain point. 17 of 19 What is GPE of a sheep that weighs 60kg and jumps off a cliff with a height of 50m? 60 x 10 x 50 =30000 J ( the number 10 is in this equation because to work out GPE you do mass x gravity x height and the gravity on earth is 10N) 18 of 19 Now work out the velocity of the sheep. KE = 1/2 x m x v² -> 30000 = 1/2 x 60 x v² -> (÷60) 500 =1/2 x v² -> (÷1/2) 1000 = v² -> √500 =v² -> 22.36 = v² 19 of 19
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