Unit 2 Physics Speed 0.0 / 5 ? PhysicsForces and MotionGCSEAQA Created by: SunsetCreated on: 03-01-14 08:47 How is momentum calculated? Mass x Velocity 1 of 18 What is the total momentum before and after an explosion? 0 Kgms-1 2 of 18 How is power calculated? Work done (J) /Time taken (s) 3 of 18 What is the only factor that affects thinking distance and braking distance (stopping distances)? Speed 4 of 18 How does speed affect braking distance? If you double speed you quadruple braking distance 5 of 18 What are the two ways of calculating acceleration? V-U/T or F/M 6 of 18 When using F=MA, what are the units of M? Kg 7 of 18 What does Newtons First Law state? An objects velocity remains constant until a resultant force acts on it 8 of 18 What is the resultant force: 17N to the left and 12N to the right? 5N left 9 of 18 What does the gradient on a V-T graph denote? Acceleration 10 of 18 What does the gradient on a D-T graph denote? Speed 11 of 18 What are the units of velocity? ms-1 12 of 18 What are the units of acceleration ms-2 13 of 18 How does a seatbelt improve car safety? It lengthens the time taken for the persons velocity to reach 0 and the force is applied over a large surface area 14 of 18 If the spring constant is 2Nm-1 and a spring extends 6m, what force was applied? 12N 15 of 18 What is the law of conservation of mass? Momentum Before = Momentum After 16 of 18 If a girl who weighs 15Kg runs 2m upstairs in 2s, what is her power? 150W (15 x 10 = 150N, 150 x 2 = 300J, 300/2 =150W) 17 of 18 What is the kinetics energy of a ball that is moving at 6ms-1 with a mass of 1kg? 18J 18 of 18
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