State if the given statement is true or false, with proper reason. (2)
a) Work done by a moving body over a closed loop is zero for all forces in nature.
b) Power is product of force and velocity, thus its direction is along the plane of force and velocity.

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Solution

$a) f o r t h e c l o s e d p a t h o v e r w h i c h t h e b o d y i s m o v i n g t h e w o r k d o n e i s a l w a y s z e r o w h a t e v e r a r e t h e o t h e r f o r c e s a c t i n g o n t h e b o d y . T h i s s o b e c a u s e d i s p l a c e m e n t o n a c l o s e d p a t h i s z e r o . b) P o w e r i s a s c a l a r q u a n t i t y, s o i t h a s n o d i r e c t i o n . P o w e r = \frac{w o r k d o n e}{t i m e} . w o r k d o n e a n d t i m e b o t h a r e s c a l a r q u a n t i t y .$

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State if the given statement is true or false, with proper reason. (2)a) Work done by a moving body over a closed loop is zero for all forces in nature.b) Power is product of force and velocity, thus its direction is along the plane of force and velocity.

State if the given statement is true or false, with proper reason. (2)
a) Work done by a moving body over a closed loop is zero for all forces in nature.
b) Power is product of force and velocity, thus its direction is along the plane of force and velocity.