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Frictional Force

a car is movi...

Question

a car is moving with constant speed on a straight line what is the net work done by the external force on the car

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Solution

$\sin c e t h e c a r i s m o v i n g w i t h c o n s \tan t s p e e d t h e f r i c t i o n m u s t b e s t a t i c a s p u r e r o l l i n g i s t h e i r . h e n c e t h e p o i n t o f c o n t a c t r e m i n s t a t i o n r y h e n c e t h e w o r k d o n e b y t h e f r i c t i o n i s z e r o R e g a r d s$

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