Karteikarten
Unit 1.1 Energy around you
Karten in diesem Stapel (21)
- 1What are the different forms energy exists in?Energy exists in many different forms, from electrical energy to sound, light and heat energy.
- 2What 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.
- 3What 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)
- 4Calculate 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 - 5Calculate how many megajoules of energy are contained in : a) 4,800,000J & b) 5,700,000,000Ja) 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 - 6What are the five different and common forms of energy?-Kinetic energy
-Heat energy
-Light energy
-Sound energy
-Electrical energy
- 7Explain Kinetic energy and give an example supporting your explanationKinetic energy is the energy of movement.Anything that moves from its place has kinetic energy. For example running or jumping
- 8Explain Heat energy and give an example supporting your explanationHeat 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.
- 9Explain Light energy and give an example supporting your explanationLight energy can come from the sun, light globes and glow-worms. An example of light energy can be light globes.
- 10Explain Sound energy and give an example supporting your explanationSound energy is the energy that air has when it is vibrating. Your ears and brains interpret the vibrating of air as sounds.
- 11Explain Electrical energy and give an example supporting your explanationElectrical energy comes from power stations solar cells, batteries and lightning. Electrical energy powers all electronics devices including your TV, computer PS4
- 12What is potential energy? Give 2 examplesPotential energy is stored energy in objects around you including petrol in a car's fuel and books on a bookshelf.
- 13Which 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.
- 14What is the process of photosynthesis?
- 15How 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.
- 16What are the four different types of potential energy?-Gravitational potential energy
-Chemical energy
-Elastic potential energy
-Nuclear energy
- 17Explain Gravitational potential energy and give an example supporting your explanationGravitational 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.
- 18Explain Chemical energy and give an example supporting your explanationChemical energy is energy stored in substances. For example, this energy is released by your body when you digest food.
- 19Explain Elastic potential energy and give an example supporting your explanationElastic potential energy is energy stored in a stretched or squashed spring. Stretched rubber bands also store elastic potential energ. For example a spring
- 20Explain Nuclear energy and give an example supporting your explanationNuclear energy is stored inside the small particles that make up all matter. For example, Nuclear energy is released in a nuclear bomb.
- 21TEST YOUR KNOWLEDGE Why the energy in food is usually stated in kilojoules rather than joules?
