In physics, if force applied on object displaces the object in the direction of force then the work is said to be done. Here all three terms; force, displacement and direction of force is important. If force is zero, work is zero; if force is nonzero but displacement is zero, work is zero and if force is non zero displacement is non zero but no part of force is in the direction of displacement, work is zero Hence we define the work as the product of force and displacement in the direction of applied force or product of displacement and force in the direction of displacement. W = force x displacement in the direction of force = F.s =Fs cos 6 Where is the angle between F and s.
It is important to understand that work done by the force does not depend on the time taken in the displacement of point of action. For example, one porter takes 5 minutes to put a box on the roof of a bus while other put the same box on the roof in 10 minutes, work done by the both the potter is same.
i) The work done by a force of 20 N in moving an object through a distance of 4 m in the direction of force is: a) 60 J
b) 70 J c) 80 J d) 90 J
(2) Define 1 J of work.
(3) List two conditions for work to be done.
(4) The work done on an object does not depend upon the
a) displacement
b) force applied
c) angle between force and displacement
d) time taken
(5) Define positive work.
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what the heck.
this long question and you think only five point is enough to answer it
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Address of the Sender]
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Dear (name of person)
Body of the letter:
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answer 1 is in the picture
2 one joule of work is said to be done when a force of 1N displaces a body by 1 m in the direction of force applied
3 the magnitude of force applied
the displacement of body
4 d
5 when the angle between force and displacement is 0° positive work is done
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