Recall Questions
Define work done (enerhgy transferred by a force)??
Work done = Force x distance moved in direction of force
How much work is done on an object by a force acting at right angles to the direction of motion of an object??
None.
Define power??
Rate of work done/Rate of energy transfer
Define the Watt??
$$1W = 1Js^{-1}$$
Define the Joule??
Work done to move a force of $1N$ (through) a distance of $1m$ through the point of application.
State the principle of the conservation of energy??
Energy cannot be created or destroyed; it can only be transferred/transformed.
Why are energy transfers in the real world not 100%??
The efficiency of a device is always less than 100% because of heat losses due to friction/air resistance.
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Metadata
date: 2021-08-03 13:41
tags:
- '@?physics'
- '@?school'
- '@?public'
- '@?work-energy-and-power'
- '@?recall-questions'
title: 'Phyiscs - Recall for Chapter 5: Work, Energy and Power'