Energy can be transferred from one form to another.Energy is transferred either by heating or by work done.Work done in pushing an object with a force a distance in the direction of the force is transferred to the kinetic energy of the object.If the object is being lifted its gravitational potential energy increases to a maximum at the maximum height.mgh = ½mv2Work done in stretching a spring is transferred to the elastic potential energy of the spring which is then transferred to the kinetic energy of the mass when it is released.The speed at which an object hits the ground is given by:v= √(2 g h)Transferring elastic potential energy to kinetic energy gives ½ke2 = ½mv2 sov2 = ke2/m
Energy Transfer
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Specification: OCR Physics A (H156), AS-level, 3.3.1 Work and conservation of energy and 3.3.2 Kinetic and potential energies. Topic: Work, Energy and Power.
Key terms in this lesson
- tension
- The force within a stretched object, such as a rope or cable, that opposes the stretching.
- work done
- The energy transferred when a force moves its point of application through a distance in the direction of the force.
- energy
- The capacity of a system to do work.
- Hooke's law
- The extension of a spring or wire is directly proportional to the force applied, provided the limit of proportionality is not exceeded.
- limit of proportionality
- The point up to which the extension of a material is directly proportional to the applied force.
More in Work, Energy and Power
- Work Done at and Angle to Motion
- Principle of Conservation of Energy
- Forms of Energy
- Kinetic Energy
- Gravitational Potential Energy
- Power
- Power and Motion
- Efficiency
All 10 lessons in Work, Energy and Power · All OCR AS-level Physics topics