torque? - Ans.fyi 參考答案

torque?

Crystal

2012-02-05 7:57 am

1.What is torque?Is it a force?

圖片參考：http://imgcld.yimg.com/8/n/HA04937267/o/701202040102013873434670.jpg

24N m代表咩?同24N有咩分別?

From http://wright.nasa.gov/airplane/torque.html

The product of the force and the perpendicular distance to a pivot (or hinge) is called the torque or the moment. Torques produce rotations in the same way that forces produce translations. Namely, an object at rest, or rotating at a constant angular velocity continues to do so until it is subject to an external torque.

如果係咁,咁torque應該係force,點解佢既unit係N m 唔係N? N m 代表d咩?

另外,T=F*d e條式點黎?唔明點解force*moment arm 會=torque

thx

更新1:

咁torque係咪即係令object rotate 既force?

更新2:

What is moment?

更新3:

sor,我問左同學了,但都好多謝你答我問題,thx

回答 (1)

天同

2012-02-05 8:58 am

✔ 最佳答案

The definition of "torque" is already given in your question. It is the product of force and the perpendicular distance from the pivot (or axis of rotation).

Mathematically, torque T is written as,
T = F.d.sin(a)
where F is the applied force
d is the distance between the point of action of the force and the pivot
a is the (acute) angle between F and d

since the unit for F is Newton (N), that for d is metre (m), and sin(a) is dimensionless. Hence, the unit for T is N.m

The result of applying a torque to an object is to cause the object to rotate. Torque is a vector quantity, normally its direction is specified as clockwise or anti-clockwise.

In the given problem, the torque of 24 N.m causes the door to rotate about the hinge in a clockwise direction.

2012-02-05 13:51:21 補充：
Q: 咁torque係咪即係令object rotate 既force?
A: A torques is NOT a force. It is a "moment" that makes an object to rotate.
Be aware that "torque" and "force" are two different vector quantities in physics.

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