Forces and energy 3.0 / 5 based on 1 rating ? PhysicsForcesGCSEAQA Created by: Emily1Created on: 26-06-13 21:01 How much work is done lifting a 250 N box by 2 m? 500 J 1 of 9 What force is needed to do 500 J of work over a distance of 5 m? 500 ÷ 5 = 100 N 2 of 9 What is the power of a machine that does 2000 J of work in 5 s? 400 W 3 of 9 How much work can a 500 W machine do in 1 minute? 500 × 1 × 60 = 30 000 J 4 of 9 How much GPE does a roller coaster car of mass 1000 kg lose when it drops 5 m? 1000 × 10 × 5 = 50 000 J 5 of 9 At the bottom of its swing, a pendulum has: Minimum GPE and maximum kinetic energy 6 of 9 A car has more kinetic energy when It is driven faster 7 of 9 Ek = ½mv2 - what is the kinetic energy of a 3 kg object travelling at 2 m/s? ½ × 3 × 2 × 2 = 6 J 8 of 9 What is the kinetic energy of a 1000 kg car driven at 13 m/s? 84 500 J 9 of 9
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