Question

can work have value ( -1 J) i mean minus 1 joule..?

Answer 1

In perspective to displacement, yes, we can work with -1 joule because you are going in opposite directions

Answer 2

velocity and be both negative and position -3j/secs

Answer 3

@HyperChemist basically what i mean is can a scalar product have negative value

Answer 4

oooh, nope, hah, good thing you knew that. A scalar problem, whatwhat I believed, is actually Constant meaning it moves in ONE direction only, therefore, opposite to displacement if you traveled 20 miles south and 30 miles north your scalar distance would be 50 miles

Answer 5

however, keep in mind that when working with physics most things are actually a value of displacement

Answer 6

But in retrospect, were looking at where things move am I correct?

Answer 7

moving back-words isnt -5 feet.

Answer 8

however if we look at it in the y and x axis perspective we find it to be so, these rules could applie in the real world however if we....hmm...well..

Answer 9

i quote
" basically what i mean is can a scalar product have negative value"

of course it can ..just the angle should be more than 90 and cos of the angle will be negative and so will be the cross product.e.g work done by friction, when we move a body against a rough surface, is negative as thre angle is 180 degrees..

Answer 10

since scalar is number so number can be negative @quarkine.

Answer 11

numbers can be negative.but the magnitude of displacement cant be..
negative signs are a measure of 'direction' a vector..what is negative or positive is basically a positive quantity along a negative or positive direction..e.g friction does negative work means that the work was opposing in nature to motion due to a force along negative direction or opposite direction wrt motion..
what i trying to say is that all scalars cant be negative just because they are numbers,but some can be negative due to their dependence on other direction dependent quantities (or of course by choice of origin/unit as in case of temperature)

Answer 12

Work can be negative. It is a scalar, so the negative sign does not imply direction.

Answer 13

By convention, negative work is when the motion is in the opposite direction of the force.
e.g. if I lift a weight up, I am doing positive work on the weight; when I let it down, I am doing negative work on the weight (gravity is doing positive work on the weight).

Answer 14

work doesn't imply direction..true..but physically it is negative due to its dependence on other direction dependent quantities...force and displacement...almost all scalars ,as far as i know,are negative due to either similar dependence or due to choice of origin/reference..