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**T**=

**r***

**F**, and

**T**=

**F***

**r**is unacceptable. Why is the latter unacceptable?

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- Thread starter Harmony
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Torque = r x F

it is a cross product

and r x F is not the same as F x r

"The cross product is anticommutative,

a × b = −b × a "

http://en.wikipedia.org/wiki/Cross_product

it is a cross product

and r x F is not the same as F x r

"The cross product is anticommutative,

a × b = −b × a "

http://en.wikipedia.org/wiki/Cross_product

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- #4

cristo

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Also, the book probably doesnt want you to confuse units of torque (meter*newtons) and units of energy (newton*meters).

Huh? The (standard) unit of torque is the Newton-metre; I've never heard of it being called a metre-Newton! Besides, clearly the units Newton and metre commute.

(http://en.wikipedia.org/wiki/Newton_metre)

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