P1: Conservation and Dissipation of Energy Flashcards
What is the Conservation of Energy?
Energy can be transfered, stored or dissipated but can never be created or destroyed.
What is Dissipated Energy?
The energy that is not usefully transferred and stored in less useful ways
What is Efficiency?
Useful energy transferred by a device ÷ total energy supplied to the device
What is Elastic Potential Energy?
Energy stored in an elastic object as a result of it being deformed. For example, a stretched spring.
What is Hooke’s Law?
The extension of a spring is directly proportional to the force applied, as long as its limit of proportionality is not
exceeded.
What is Input Energy
Energy supplied to a device.
What is Power?
The energy transformed or transferred per second. The unit of power is the watt (W).
What is the Spring Constant?
Force per unit extension of a spring.
What is Useful Energy?
Energy transferred to where it is wanted in the way that is wanted.
What is Wasted Energy?
Energy that is not usefully transferred
What is Work?
The energy transferred by a force. Work done (joules, J) = force (newtons, N) x distance moved in the direction of
the force (metres, m).
