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This blog was opened by (SOPHIAARON) to accomodate (SOPHIA)'s Science journal.Do enjoy your stay here, and don't take what's not yours! tagboard
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Physic- 13
Principle of Moments: What I have infered from today's lesson: These are somewhat related to moments: 1) Lever 2) Beam Balance ---------------------------------------------------------- The Principle of Moments, is also known as Varignon Theorem. states that the moment of any force is equal to the algebraic sum of the moments of the components of that force. Moment has the same meaning as torque. Accroding to wikipedia, torque, is an important basic concept in physics. Other than that, torque is often used in civil engineering and mechanical engineering. Mr Lim mentioned that once you have mastered the basics of that, you can actually design and building. Wow...but designing a building for people now is quite off the topic now. heh. Torque is usually used to describe a rotational force down a shaft, for example a turning screw-driver, whereas "moment" is more often used to describe a bending force on a beam. The turning effect is called the moment of a force(: and it makes work easier for us.  above is a picture of 2 persons balancing on a see-saw. This is the formulae: Moment of a force, M = F x D Moment of a force, M = Force x Perpendicular distance from the fulcrum to the line of action of the force. So therefore, the S.I. unit of moment of a force is Newton Metre ( Nm ). Does the beam balance always turn anti clockwise or clockwise? --No, this is dependable. We would see different direction the beam balance move when we stand at different views. --------------------------------------------------------------------------- Question: If a lever(see-saw) has nothing on the sides, what's the moment acting on the fulcrum? Answer: The moment is 0. This is so as the concept of moment is F x D, there's no force acting on the lever at all. Well, other than gravity. So, force = 0 and distance from force is also = to 0, then 0 x 0 = 0(: References: Science matters. By the way, does anyone knows what's denison?
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