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why does a horse continue to apply a force to move a cart?

why does a horse continue to apply a force to move a cart?

Grade:9

1 Answers

Arun
25750 Points
5 years ago
Dear Krithika
 
According to Newton's First Law a body remains in its state of motion or rest until an external force acts on it. 
But in this case the horse has to continously extert the force to move the cart, this is because the force of friction is acting against the motion of the cart which us opposing its motion.So the horse has to apply force to overcome this force of friction. 
 
Regards
Arun (askIITians forum expert)

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