The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:  (a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket. from Physics Work, Energy and Power Class 11 Manipur Board
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The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: 

(a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.


Positive

In the given case, force and displacement are in the same direction. Hence, the sign of work done is positive. In this case, the work is done on the bucket. 
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What is watt?

SI unit of power is Watt. 
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What are different units of energy?

The different units of energy are :

(i) Joule            
(ii) Erg
(iii) eV            
(iv) KWh
(v) Calorie.

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Define watt.

Power is said to be one watt if one joule of work is done in one second. 
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Define the unit joule.

Work done is said to be one joule if one newton of  force displaces the body through a distance of one meter in the direction of applied  force .
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Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e. F with rightwards arrow on top times S with rightwards arrow on top.

And dot product is a scalar quantity. Therefore, work is a scalar quantity. 
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