distinguse between positive work and negative work
Answers
Answer:
Positive work: when force and displacement are in the same direction, the work performed on an object is said to be positive work. ... Negative work: Negative work is performed if the displacement is opposite to the direction of the Force applied.
Answer:
When the angle between the force and the displacement is less than 90 degrees, then the work is found positive, that’s why such work is called positive work. This sort of work is also called ‘Work by force’. On the other hand, when the angle between the force and the displacement is greater than 90 degrees,...
Because the definition of work is the dot product of the force and displacement vectors, I can see that work is negative when the force acts in the "opposite" direction of the displacement. Also, I see that W = - (delta)PE. I ask this question as a result of encountering two concepts that seem to contradict these statements. The first: