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1. Energy can also be stored as potential energy: gravitational potential energy (GPE) and elastic potential energy (EPE) 2. Describe energy transfer between GPE, kinetic energy (KE) and EPE Slide 2 Record what happens with the balloon, toy and the spring. Slide 3 10.4 Potential energy We have met one form of energy that is often stored Chemical energy How is it stored? Slide 4 10.4 Potential energy Any form of stored energy is called potential energy What does potential mean? Slide 5 Potential: an ability to do something that hasnt been used yet. Potential Energy: the ability to release energy. Stored chemical energy is called Chemical potential energy Slide 6 10.4 Potential energy Elastic potential energy (EPE) This is stored in elastic materials such as rubber, metal springs and elastic. There are 2 other types of potential energy Slide 7 10.4 Potential energy Gravitational potential energy (GPE) Gravitational potential energy is energy an object has because it is high up. It only releases this energy when it falls down. Slide 8 10.4 Potential energy So what happens to the energy in the rock when it falls? GPE is transferred as kinetic energy (KE) in the movement of the falling rock. The energy is then transferred to the plants and the ground when the rock hits the floor. Slide 9 10.4 Potential energy Bouncing You can see both GPE and elastic potential energy in a bouncing ball.The ball has high GPE when it is held up. Slide 10 10.4 Potential energy Bouncing This GPE changes to KE as it travels downwards. Slide 11 10.4 Potential energy Bouncing KE changes to elastic energy in the ball at the bottom of the fall. Slide 12 10.4 Potential energy Bouncing The ball bounces up again and the elastic energy changes to KE again. Slide 13 Write the transfer of potential energies form the video Slide 14 Experiment #1 1. You need a tray with sand, a golf ball, a metre stick, 30cm ruler and goggles. 2. Drop the golf ball from a height of 25cm, 50cm, 75cm and 100cm. 3. Record the width and depth of the crater left by the golf ball in a table. 4. What relationship do you see? Experiment #2 1. You need a metre stick and a bouncy ball. 2. Drop the ball at 50cm, 100cm, 150cm and 200cm on the ground. 3. Record the height of the bounce of the ball in a table. 4. What relationship do you see?