While we think of weight as "mass", it is actually the pull of gravity on the object.  For example,  4.5 kilograms (kg) near Earth is pulled with a force of about 45 newtons, that is, the same force we call "10 pounds" here in the U.S. where the metric system is not as familiar.   Now put a 10 lb box at rest on a flat table.  What is the total force on the box?     mg That's the force of gravity downward on the box.     0 There is no net force on the box.       The frictional force F which is μ mg     N That's the normal force of the table pushing up on the box. How fast will an object be falling if dropped from rest and allowed to fall for 94 seconds? Use g = 10 m/s2 and give your answer in m/s

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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?”