Difference between revisions of "Work Done"
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==Key Stage 3== | ==Key Stage 3== | ||
===Meaning=== | ===Meaning=== | ||
| + | {{Infobox physical quantity | ||
| + | | bgcolour={pink} | ||
| + | | name = Work | ||
| + | | image = [[File:Baseball pitching motion 2004.jpg|250px]] | ||
| + | | caption = A [[baseball]] [[pitcher]] does positive work on the ball by applying a force to it over the distance it moves while in his grip. | ||
| + | | basequantities = 1 [[kilogram|kg]]⋅[[metre|m]]<sup>2</sup>⋅[[second|s]]<sup>−2</sup> | ||
| + | | unit = [[joule]] (J) | ||
| + | | otherunits = [[Foot-pound (energy)|Foot-pound]], [[Erg]] | ||
| + | | symbols = ''W'' | ||
| + | | dimension = '''M''' '''L'''<sup>2</sup> '''T'''<sup>−2</sup> | ||
| + | | derivations = ''W'' = '''[[force (physics)|F]]''' ⋅ '''[[Displacement (vector)|s]]''' <br /> | ||
| + | ''W'' = ''[[torque|τ]]'' ''[[angle|θ]]'' | ||
| + | }} | ||
[[Work Done]] is the amount of [[Energy Transfer|energy transferred]] by the action of a [[force]]. | [[Work Done]] is the amount of [[Energy Transfer|energy transferred]] by the action of a [[force]]. | ||
Revision as of 10:16, 9 October 2018
Key Stage 3
Meaning
Template:Infobox physical quantity Work Done is the amount of energy transferred by the action of a force.
About Work Done
- Work Done is measured in Joules.
- Work Done can only be calculated for objects moving in the direction of the force.
Equation
\[ Work Done = Force \times Distance moved in the direction of the force\] \[ W = F \times d\] \[ W = Fd\]
- Work done is written with a capital W. Force is written with a capital F. Distance is written with a lower case d.
Example Calculations
- 1. A person lifts a 40N box by a height of 1.2m. Calculate the work done by the person against gravity.
- Force = 40N
- Distance moved in the direction of the force = 1.2m
\[ W = Fd\] \[ W = 40 \times 1.2\] \[ W = 48J\]
- 2. The brakes on a car apply a force of 10,000N. The car travels a distance of 15m braking. Calculate the work done by the brakes.
- 3. A person carries a 20N box along a horizontal path of 20m.