Work and Power
In this title, you will learn about some of the different types of energy: gravitational potential, elastic potential and kinetic energy. Gravitational potential energy is the energy that an object has because of its position in a gravitational field. Elastic potential energy is the energy stored in a stretched elastic object, such as a rubber band or a spring, and kinetic energy is the energy of an object that is moving. You will also learn about how forces transfer energy to heat, and the role this plays in creating waste energy. This prevents processes from being 100% efficient. The title will explore 'work done', how it relates to energy transfers, and how it is calculated from the exertion of a force over a distance. Finally, you will learn about the rate of doing work, and how power is calculated.
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Curriculum and Exam Board Information
- Advantages and disadvantages of generating electricity using different
- Elastic Potential
- Energy transfer by movement of particles in conduction and convection
- For an object that is able to recover its original shape, elastic potential is the energy stored in the object when work is done on the object to change its shape
- Friction and Heat
- Kinetic Energy
- Kinetic energy = 1/2 mass x (speed)2
- Kinetic energy is movement energy
- Power = work done/time taken
- Power as the rate of transfer of energy or the rate of doing work
- Power is the rate of doing work, measured in watts
- recall and use the formula; power = work done/time taken
- recall and use the relationship; work = force × distance moved in the same direction as the force, and that work is measured in joules
- Sources of energy for generating electricity
- The amount of work done, force and distance are related by the equation: work done (joule, J) = force applied (newton, N) x distance moved in direction of force (metre, m)
- The kinetic energy of a body depends on its mass and its speed. The kinetic energy of a body can be calculated using the following equation: kinetic energy (joule, J) = 1/2 x mass (kilogram, kg) x speed2 ((metre/second)2, (m/s)2)
- When a force causes a body to move through a distance, energy is transferred and work is done
- Work done = energy transferred
- Work done against frictional forces is mainly transformed into heat
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