Kinetic Energy 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: LSmithCreated on: 26-03-14 14:54 Work done and energy transferred are measured in... joules, J. 1 of 36 Objects gain ____________ when they are raised. gravitational energy 2 of 36 Moving objects have ........ kinetic energy. 3 of 36 Work is done whenever a _____ moves something. force 4 of 36 Whenever work is done, _____ is transferred from one place to another. energy 5 of 36 W = F × d W = ? W = work done (joules, J) 6 of 36 W = F × d F = ? F = force applied (newtons, N) 7 of 36 W = F × d D = ? D = distance moved in the direction of the force (metres) 8 of 36 e.g. 10 N is applied to move the box 2 m. Work done = 10 × 2 = 20 J 9 of 36 Power is a measure of how ____ work is being done, so how quickly ______ is being transferred. quickly, energy 10 of 36 P = E ÷ t P = ? P = power (watts, W) 11 of 36 P = E ÷ t E = ? E = work done (joules, J) 12 of 36 P = E ÷ t t = ? t = time taken (seconds, s) 13 of 36 e.g. An electric drill transfers 3000 J in 15 s. What is its power? Power = 3000 ÷ 15 = 200 W 14 of 36 On Earth we always have the force of _____ acting on us. gravity 15 of 36 When we are above the Earth’s surface we have potential (stored) energy. This is called........ gravitational potential energy 16 of 36 What does the amount of gravitational potential energy an object on Earth has depends on? its mass, and its height above the ground. 17 of 36 If an object is lifted, work is done ______ gravitational force. against 18 of 36 Ep = m × g × h Ep = ? Ep = the change in gravitational potential energy (joules) 19 of 36 Ep = m × g × h m = ? m = mass (kilograms, kg) 20 of 36 Ep = m × g × h g = ? g = gravitational field strength (newtons per kilogram, N/kg) 21 of 36 Ep = m × g × h h = ? h = change in height (metres, m) 22 of 36 e.g. A book with a mass of 0.25 kg is lifted 2 m onto a bookshelf. If g is 10 N/kg, what is the change in gravitational potential energy? Ep = 0.25 × 10 × 2 = 5 J 23 of 36 All ______ objects have kinetic energy. moving 24 of 36 What does kinetic energy an object has depends on? its mass, and its speed. 25 of 36 Ek = ½ × m × v2 Ek = ? Ek = kinetic energy (joules, J) 26 of 36 Ek = ½ × m × v2 m = ? m = mass (kilograms, k) 27 of 36 Ek = ½ × m × v2 v = ? v = speed (metres per second, m/s) 28 of 36 e.g. What is the kinetic energy of a 1000 kg car travelling at 5 m/s? Ek = ½ × 1000 × 52 = 500 × 25 = 12500 J 29 of 36 What is a pendulum? A simple machine for transferring gravitational potential energy to kinetic energy, and back again. 30 of 36 When the bob is at the highest point of its swing, it has no ________ _______, but its gravitational potential energy is at a maximum. kinetic energy 31 of 36 As the bob swings downwards, gravitational potential energy is ________ to kinetic energy, and the bob accelerates. transferred 32 of 36 At the _____ of its swing, the bob’s kinetic energy is at a maximum and its gravitational potential energy is at a minimum. bottom 33 of 36 As the bob swings upwards, its kinetic energy is transferred to ___________ ________ _____ again gravitational potential energy 34 of 36 At the top of its swing, it once again has no ______ ______, but its gravitational potential energy is at a maximum. kinetic energy 35 of 36 The bob’s swing will become lower with each swing, because some energy is also transferred as ___ to the surroundings. heat 36 of 36
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