Energy Stores and Transfers PDF

How does our energy change as we walk? Learning Intention: To understand how energy can be stored and transferred. Success Criteria: Can I name the 8 energy stores? Can I name the 4 ways energy is transferred? Can I describe all the changes involved in the way energy is stored when a system changes...

How does our energy change as we walk? Learning Intention: To understand how energy can be stored and transferred. Success Criteria: Can I name the 8 energy stores? Can I name the 4 ways energy is transferred? Can I describe all the changes involved in the way energy is stored when a system changes? Do now: Name as many energy stores as you can? Challenge: What is energy? Key Words: Energy Store Transfer Conservation Homework: Quiz 1 How does our energy change as we walk? Match the different energy stores to their definitions. Challenge: What is energy? Homework: Quiz 2 Stores Kinetic Magnetic Elastic Potential Thermal ( Internal) Electrostatic Nuclear Gravitational Chemical Energy can be transferred from one store to another. This happens in four ways. Energy transfers: By heating By an electric current By a force By waves (eg. light or sound) also called Radiation 4 Example: Describe the energy changes that take place when a ball is dropped from a height. Where is the energy stored when the ball is high up? Where is the energy stored as the ball moves faster? 5 Example: Describe the energy changes that take place when a ball is dropped from a height. Gravitational energy store Kinetic energy store Which pathway? 6 Example: Describe the energy changes that take place when a ball is dropped from a height. Gravitational energy store Kinetic energy store By a force (weight) 7 Describe the energy changes that take place when a ball is dropped from a height. Write it as a sentence: Energy is transferred from the gravitational energy store when the ball is high up… …to the kinetic energy store as the ball falls by the force of weight. Gravitational energy store Kinetic energy store By a force (weight) 8 Does all the gravitational energy turn into kinetic energy? No! There is some wasted energy, in: Thermal (heat) Sound Gravitational energy store Kinetic energy store By a force (gravity) By a wave Sound Thermal (wasted) 9 Example 2: When a stretched rubber band is released, it moves across the room. ? store ? store Which pathway? 10 Example 2: When a stretched rubber band is released, it moves across the room. Elastic potential energy store Kinetic energy store By a force As a sentence? 11 Example 2: When a stretched rubber band is released, it moves across the room. Energy is transferred from the elastic potential energy store when the rubber band is released… …to the kinetic store as the rubber band moves Elastic potential energy store Kinetic energy store By a force 12 We can show energy transfers in a diagram: ??? ??? Challenge: what are the names of the stores and transfers? ??? We can show energy transfers in a diagram: What situation does this diagram represent? Challenge: is this lamp efficient? Justify your answer. ? Knowledge check Write your answer on your ipads A candle is lit. Where is the energy stored before the candle starts burning? A: The kinetic energy store B: The thermal energy store C: The chemical energy store D: The gravitational potential store A candle is lit. As the candle burns, the air gets warmer. Where has the energy from the chemical energy store of the candle been transferred to? A: The thermal energy store of the air B: The kinetic energy store of the air C: The chemical energy store of the air D: The gravitational potential store A candle is lit. How is the energy transferred from the chemical energy store of the candle, to the thermal energy store of the air? A: By a force B: By an electric current C: By heating A battery-powered drone is flown upwards at a steady speed. Which energy store increases? A: Kinetic B: Chemical C: Gravitational potential D: Nuclear A battery-powered drone is flown upwards at a steady speed. Which energy store decreases? A: Kinetic B: Chemical C: Gravitational potential D: Nuclear Task: Describe the changes in energy when: 1* A ball is thrown upwards 2* Water is boiled in an electric kettle 3* A battery-powered torch is turned on. Challenge: 1* Where is energy stored in your muscles? 2* Explain using energy stores why a chocolate bar is better to eat before a race than an apple. 3* Describe the energy changes when you eat a chocolate bar and run a race. Exam Question Practice Exam Question Practice (real GCSE question!) (3 marks) Without looking back at your book, sort these into energy stores and energy transfers 25