# NCERT Exemplar Solutions Class 9 Science Solutions for Force and Laws of Motion - Exercise in Chapter 9 - Force and Laws of Motion

Question 18 Force and Laws of Motion - Exercise

A horse continues to apply a force in order to move a cart at a constant speed. Explain why?

When the cart moves on the road it has to encounter the friction. In order to keep the cart moving horses should overcome the friction. Hence it continues to apply the force.

Video transcript
"hello everyone welcome to little this is priya and here we have an exciting question let us try to solve this question so the question is a horse continues to apply a force in order to move a cart at a constant speed explain why so when coming to the question a horse will continuously apply a force to move a cut because in a constant speed why the horse has to apply force on the car to make the car to move at a constant speed this is because when the car moves on the road the road encounters a friction against this moving cart so in order to keep the cart moving horses should overcome the friction on which the road is applying on the cart so to overcome the friction which has been applied on the cart that horse has to continuously apply some force this makes the guard to move at a constant speed so that's why the horse has to apply more and more force on the cart in order to overcome the friction what has been applied on the card by the road so that's why the horse has to apply more and more force so this is the reason why the horse is continuously applying a force on a car to move at a constant speed hope you understand this video if you like my video please subscribe to our leader channel and if you have any doubts you can keep a message in comment box thank you "
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