Q. 114.0( 2 Votes )
When a force retards the motion of a body, the work done is :
A force can retard the motion of an object only when it will acts in opposite direction of motion of body, this means that angle between the direction of motion of body and direction of force is 180°.
When force is applied at an angle to the direction of motion of object then the work in the direction of motion is given by: W = Fs cos θ
Since cos 180°= -1,
So, Work done = -F×s
which is negative.
Rate this question :
Give reason for the following :
Pardeep says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with him? Why?Evergreen - Science
Which of the following does not possess the ability to do work not because of motion?
A. A sparrow flying in the sky
B. A sparrow moving slowly on the ground
C. A sparrow in the nest on a tree
D. A squirrel going up a treeLakhmir Singh & Manjit Kaur - Physics
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?Lakhmir Singh & Manjit Kaur - Physics
In case of negative work, the angle between the force and displacement is:
A. 0o B. 45o
C. 90o D. 180oLakhmir Singh & Manjit Kaur - Physics
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.Lakhmir Singh & Manjit Kaur - Physics
Is it possible that a force is acting on a body but still work done is zero? Explain giving one example.Lakhmir Singh & Manjit Kaur - Physics
When a force retards the motion of a body, the work done is :Evergreen - Science