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Description
Flashcards by Ahmed Almohammed, updated more than 1 year ago
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Created by Ahmed Almohammed
over 8 years ago
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| Question | Answer |
| What are the different forms energy exists in? | Energy exists in many different forms, from electrical energy to sound, light and heat energy. |
| What is work? and how do you know work has been done? | Work is the name given to the effects of using energy.Whenever an object is shifted or forced to change shape, then work has been done. |
| What is the unit of measuring energy? | Energy is measured using a unit called the joule (J). In fact, a joule is so small that energy is often measured in kilojoule (kJ) and megajoules (MJ) |
| Calculate how many joules of energy are contained in a -2kJ<----------------- -3.5 MJ<------------- | a) 2kJ = 2 x 1000 = 2000J & b) 3.5MJ = 3.5 x 1 000 000 = 3 500 000J |
| Calculate how many megajoules of energy are contained in : a) 4,800,000J & b) 5,700,000,000J | a) 4,800,000J = 4,800,000 ÷ 1,000,000 = 4.8MJ b) 5,700,000,000J = 5,700,000,000 ÷ 1,000,000 = 5,700MJ |
| What are the five different and common forms of energy? | -Kinetic energy -Heat energy -Light energy -Sound energy -Electrical energy |
| Explain Kinetic energy and give an example supporting your explanation | Kinetic energy is the energy of movement.Anything that moves from its place has kinetic energy. For example running or jumping |
| Explain Heat energy and give an example supporting your explanation | Heat energy can come from the sun, flames, chemical reactions and also a from an animal. Heat warms,burns,dries and melts. For example burning wood. |
| Explain Light energy and give an example supporting your explanation | Light energy can come from the sun, light globes and glow-worms. An example of light energy can be light globes. |
| Explain Sound energy and give an example supporting your explanation | Sound energy is the energy that air has when it is vibrating. Your ears and brains interpret the vibrating of air as sounds. |
| Explain Electrical energy and give an example supporting your explanation | Electrical energy comes from power stations solar cells, batteries and lightning. Electrical energy powers all electronics devices including your TV, computer PS4 |
| What is potential energy? Give 2 examples | Potential energy is stored energy in objects around you including petrol in a car's fuel and books on a bookshelf. |
| Which form of potential energy enables you to run , play sport and keep your heart beating? | One form of potential energy is chemical energy your body gains from eating food. |
| What is the process of photosynthesis? | |
| How much energy do you need for a healthy lifestyle? | For a healthy lifestyle, the energy you put into your body from food should be about the same as the energy you require for your body to function. |
| What are the four different types of potential energy? | -Gravitational potential energy -Chemical energy -Elastic potential energy -Nuclear energy |
| Explain Gravitational potential energy and give an example supporting your explanation | Gravitational potential energy is energy stored in an object when it is above the ground. The greater the height, the more gravitational potential energy it has. For example a water slide. |
| Explain Chemical energy and give an example supporting your explanation | Chemical energy is energy stored in substances. For example, this energy is released by your body when you digest food. |
| Explain Elastic potential energy and give an example supporting your explanation | Elastic potential energy is energy stored in a stretched or squashed spring. Stretched rubber bands also store elastic potential energ. For example a spring |
| Explain Nuclear energy and give an example supporting your explanation | Nuclear energy is stored inside the small particles that make up all matter. For example, Nuclear energy is released in a nuclear bomb. |
| TEST YOUR KNOWLEDGE Why the energy in food is usually stated in kilojoules rather than joules? |
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