Moments | GCSE Physics | Doodle Science

GCSE Science

Doodle Science teaches you high school physics, in a less boring way, in almost no time!

Script:

A moment is the turning effect of a force. It’s calculated by multiplying the force by the perpendicular distance between the force and the pivot. For example, by turning a spanner you are producing a moment. If you apply a force of 15N to the end of the spanner and the length of it is 0.1m, then the moment you are applying is 1.5Nm.

However you can apply a force that is not perpendicular, in which case the distance is not the length of the spanner but is the distance from the line of action of the force to the pivot. This will produce a smaller moment, so to produce the maximum moment, you need to apply force at 90 degrees.

Moments are often referred to as force multipliers because they reduce the force needed to perform certain tasks. You’ve probably all experienced this at some point in your lives but haven’t realised the reason why. Using a wheelbarrow is an example of a lever being used to reduce the effort necessary to lift the load. It works using the concept of balanced moments. An object is balanced when the sum of the clockwise moments about a pivot are equal to the sum of the anticlockwise moments about the same pivot.

For example, if a force of 300N is applied 2m from the pivot, and another force of 700N is applied on the other side of the pivot then it must be applied 0.86m from the pivot in order for the moments to balance. This means that you can apply small forces at further distances to achieve much greater forces on the other side. Which is why you’ll find it much easier to close your door from the handle rather than near the hinges.

References:
2. CGP GCSE Physics AQA Revision Guide.

[r.d.e.]

awesome vid. everyone should take a moment to really learn what a moment is by watching this

[sanskartiwari]

Short, informative, straight to the point and easy to understand.
Superb!!

[sam-bkhg]

0:11 <-- Dat voice when sayin "force" tho

[nonshatter]

Good, quick, straightforward explanation with decent examples. Nice job.

[bethanw]

this is way better than my science teacher

[fawzimohd]

Amazing, I used this vid for my class students and they were completely amazed and they took full marks in quiz because of this vid hope u the best and plzz don't stop

[McPhysX]

Awesome, I used this video to teach fencing! How to take control of the opponent's blade just by placing it correctly and have mechanical advantage.

[starry]

1:26 was really well explained thank you!

[grigorij]

Thank you very much for the lear and easy to Understatement explanation

[logansept]

trying so hard to be minute physics

But thanks for the good accurate info

[varunparikh]

superb video. This has really helped me in my physics
GOOD

[AliHaider-wxoz]

thats's easy to understand
thanx dude

[Triathletep]

The whole reason why i clicked your video was to see why on earth you would draw the force non-perpendicularly to the nut lol

[xenemous]

So why don't these guys have a million subs?

[DehGlitcherZz]

Hey. Is there any chance you could do another video about moments or point me somewhere where I could check? I've been stuck on this topic for ages and my physics GCSE is in 3 days.

[zo]

could u make a website where u write notes fir students it would be so much easier

[paulkta]

I was marked wrong for using the right unit for moment (N/M)

[anuraramanayake]

Its briliant. but speed is very high

[TaMeApollo]

You remind me of minute physics but you're British

[urvi.x]

stop reading the comment and watch the video