Work Done - A Level Physics

This video introduces and explains work done for A Level Physics.
Generally, the work done equation is given as: work done = force x distance, W = Fs. More specifically, work done = force applied x distance in the direction of the force. If a constant force causes an object to move, then we say that the force is doing work (mechanical work) on that object. If the force is not parallel to the direction of movement, then we need to resolve the force into its components.
Thanks for watching,
Lewis
This video is recommended for anyone studying A Level Physics in the following exam boards:
AQA
CIE
Edexcel
Edexcel IAL
Eduqas
IB
OCR A
OCR B
WJEC
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[@connerbuxton3320]

Well, that's my work done for the day.

[@craigfowler7098]

Think the young presenter has a gret future ahead of him

[@QuaternionPhysics1]

Thank you so much for this video. I was genuinely confused in my Physics lesson as my teacher was over complicating things and didn't explain it well enough for me to fully understand. Thanks to you, i understand this better

[@jananisatkurunathan5898]

Thank you so much for your videos - they are so helpful. I am a teacher and my biggest regret in life is not doing A level Physics but I could not find any textbooks that made it easy for me to understand. Without your videos, I would not have been able to increase my Physics knowledge. Also sorry one question - please can you explain where you got cos theta from? I do not understand.

[@Maheen_who]

By considering it a right angled triangle the direction in which force F is applied is the hypotenuse and the horizontal component (distance ) is the base. Hence we know that cos theta is equal to base/ hypotenuse.

[@vinethkawmududesilva3662]

great video

[@abdullahsadventure4851]

bro is the biggest AFOLs

[@furywasrobbed5135]

So please can you tell me what displacement we need. Is it the hypotenuse? Or the vertical? Or horizontal?

[@PhysicsOnline]

The horizontal

[@furywasrobbed5135]

A Level Physics Online why is this? Isn’t the displacement the hypotenuse?

[@furywasrobbed5135]

And when would you use the vertical

[@PhysicsOnline]

Its the direction moved in the direction of the force. So best to find the component of the force that is in the same direction as the distance traveled.

[@zeeshanahmed9141]

shouldnt this be F.sSin?

[@leahthomas8861]

Horizontal components use cos and vertical components use sin

[@spikeman4200]

Is it always cos?

[@anushasubramaniam9147]

Daniel Guirgis it depends if the force is based on the horizontal axis or vertical axis. You can use trigonometry in finding the the forces.

[@alimuhammadbaig5054]

The reason we use cosine, is because we measure "Work Done" by the displacement that has occured. As the displacement occurs because of the horizontal component of the applied force that is why we only consider that.

[@hamzasaleh3482]

If a question asks to calculate the resistive force how would I go about it

[@PhysicsOnline]

+hamza saleh Provided the object moves at a constant velocity then the resistive force will be equal and opposite to the pushing force used to move the object. If you know the energy transferred (the work) and the distance you can then find the force applied.

[@hamzasaleh3482]

ok cheers

[@ericjones1796]

yea

[@kaivanshah4304]

amazing

[@junng6848]

Is typing on a computer keyboard considered work in a physics sense?

[@PhysicsOnline]

+Jun Ng Not really. There may be a small amount of work as you press each key down, however the force is small and the distance is tiny, so a very small amount of work actually takes place! You are not even working while you're reading this!

[@junng6848]

+A Level Physics Online Lol, thanks