how many days require to revise work energy power lesson
Answers
Answer:
Work:- Work done W is defined as the dot product of force F and displacement s.
Here θ is the angle between and .
Work done by the force is positive if the angle between force and displacement is acute (0°<θ<90°) as cos θ is positive. This signifies, when the force and displacement are in same direction, work done is positive. This work is said to be done upon the body.
When the force acts in a direction at right angle to the direction of displacement (cos90° = 0), no work is done (zero work).Work Done by a Man
Work done by the force is negative if the angle between force and displacement is obtuse (90°<θ<180°) as cosθ is negative. This signifies, when the force and displacement are in opposite direction, work done is negative. This work is said to be done by the body.
Answer:
one night is enough if your understanding is good