A dog musher asks his dogs to pull the sled. they feel that since the sled will

Question

A dog musher asks his dogs to pull the sled. they feel that since the sled will pull on them with the same force that they exert on it, they wont be able to go anywhere. they say if we can never exert a force on the sled which is greater than the backward force it exerts on us, how can we ever get the sled moving?
how can you counterargue this using newtons laws? I was thinking about the 2nd law in reference to a greater force being applied in the forward direction will exceed the backward direction, thus moving the sled. Am I correct, or is there more?

Explanation / Answer

This is justified by newton's first law . The body continues to be in the state of rest until any external force acts on it . Now the external forces acting on body will be pulling force and frictional force and both will be opposite in direction. But frictional force can attain a max value = Us x N Us= coefficient of static friction and N = normal reaction at surface of contact F(ext)- F (friction) = F (net) and F(net)>0 for motion so Fext > F friction

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