Anonymous

no

Anonymous

No, work can never be negative, since the force (F) and the amount of movement, i.e., distance (d) are also never negative.

Anonymous

Work is not the product of force and displacement, it's the DOT product of force and displacement. Dot product is the product of the magnitude of two forces (magnitude can't be negative) and the cosine of the angle between them. If a force is applied to an object causing that object to move, the object will move in a direction that's within 90 degrees of the applied force. For example, pushing a box to the west can't cause it to move northeast; pushing down on a car can't cause it to fly up in the air. Since the angle is at least 0 degrees but less than 90 degrees, its cosine must be positive. Therefore, work can't be negative.

Anonymous

Suppose you hoist a box of mass m from the floor and put it on a table whose plank has height h above the floor ; after a while you take the box and lower it to the floor . What's the total work you have done ? It is zero , because the displacement is zero ...so : Wup+Wdown = 0 Wdown = -Wup If you conventionally consider posite the work Wup = m*g*h, then Wdown must be negative

Anonymous

Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.

Anonymous

Definitely. It is F.d where F and d are vectors. It is not F *d as a simple number. So that the answer could be given as |F| * |d| * cos( theta) where theta is the angle between the vectors. ie depending on the angle work must lie as More than -|F|*|d| and less than +|F| * |d| Now to interpret it. If you push in the same direction as something is already moving then you give it energy. You can push it up hill or you can speed it up. That is positive work done ON the object. If you push AGAINST the direction that it is moving you take energy FROM the object. ie you stop it from rolling downhill or you slow it down. Negative work don ON the object removes energy from its motion.

Anonymous

work is the product of a moving force and the distance that it moves. work can be done against the field or with the field of gravity. Work is energy used when a certain amount of power is used for a certain amount of time .As per the 2nd law of thermodynamic work cannot be obtained without paying a price. The less work one does the more negative it becomes.

Anonymous

Only if you use imaginary numbers. Otherwise it's like trying to have negative velocity.

Anonymous

HAHAHAHAHA. THIS IS SOOOOO EASY!!!

Anonymous

Possibly, I have worked with SOME PEOPLE who are WORSE than no help.

Anonymous

Yes... When you bring down mass m by h height. The work done here will be W = - (mg) h (mg) <- F (force) (h) <- d (distance)

Anonymous

Energy is only counted as work if it is in the direction of the applied force, thus work is positive. If the direction of travel is negative it will be due to other forces.