The Principle of Moments - A Level Physics
ฝัง
- เผยแพร่เมื่อ 1 มิ.ย. 2015
- This video introduces and explains the principle of moments for A Level Physics.
Apply a force at a distance and you have a turning effect which we call a moment. I show you how to calculate the moment when a force acts at an angle. Finally, for an object in rotational equilibrium the sum of the anti-clockwise and clockwise moments is zero. This is the principle of moments.
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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in 7 minutes, i learned a lot..!!
Thanks Dave 👍
Learnt more in this than a 6 hour lesson
You explained it very well! Thank you!
You're really good man. Keep it up!
Thanks for the help :)
Would you please do a few videos breaking down the substituting formulas in the multiple-choice questions that involve algebra. Some are so tricky, and nobody seems to break the math down.
Hope I make sense.
Will a force parallel to the lever and have perpendicular distance from the pivot produce moment?
Golden!
Thanks for the explanation.From Papua New Guinea 🇵🇬.
when do you use fxsin(theta)?
It's just about the angle you are considering.He is considering the angle relative to the line that is perpendicular to the distance line - as seen at 4:37. If he considered the angle relative to the distance line itself, then sine, which is 90 - theta, is used.
Why does the theta in the pivot the same in the force actiing on it? Im a noob help:'(
Thank you. I was stuck on this
But how is that 90-θ to begin with
Nvm, it's because the dotted line is perpendicular to the black surface
Could you give real Values instead because the letters confuse me on which are the actual unknowns (what you're trying to work out)!
He's trying to work out the vertical component of an angled force, then he multiplies this by x to figure out the moment caused by that force.
5:37 Why can we ignore the horizontal component of the force?
Because the force acts perpendicular to the line of action
(y)
💯✍🏼
At 3.15 why is theta next to the pivot??
The first theta above the beam in the diagram is given. The theta across from it, is a vertical angle, which therefore means it is equal. Next to this theta, is the complimentary angle of theta, which is 90 deg - theta. Since angles in a triangle have to add up to 180 degrees, and since the angle by the square box is defined as 90 degrees, the remaining angle is theta, when we subtract 180 deg - 90 deg - (90 - theta).
3:06 how this ange is thetha
Vertical angles. I.e. angles that are directly across a pair of intersecting straight lines from each other.
Omg lol