3. The force of Planet 2M on Planet M is F = 109 N, then the force of Planet M on 2M is ______ N. 1. An object of mass m is at rest on a flat horizontal surface. The coefficient of static friction between the object and the surface is μ. A horizontal force of magnitude F is applied to the object, but the object does not move. The magnitude of the static frictional force on the object is:

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”