A simple pendulum, consisting of a mass m tied to an inextensible mass rope
negligible and length L, oscillates in such a way that when the mass is at its maximum
height the rope forms an angle of 10 ° with the vertical. Calculate the work done:
A) by weight force when the pendulum moves from the highest to the lowest point AND VICEVERSA
I know that the answer is mgL(1-cos10) but I don't understand the sign. Is it +mgL(1-cos10) or mgL(1-cos10)?
or - mgL(1-cos10)?
- WhomeLv 71 month agoFavorite Answer
Work is positive when the force direction and the movement direction are identical.
As "down" is associated with the direction of gravity and weight, gravity does positive work when the mass is falling. "AND VICEVERSA"
- billrussell42Lv 71 month ago
work done by the weight moving down is positive.
work done by the weight moving up is negative.