On this inclined plane made of stone Senefer the Egyptian architect has a 5000 kg block he needs to drag up a 45º ramp. He needs to know if it will slide down when his crew isn’t pulling on it. The coefficient of static friction is 0.6 for the block and the ramp. Calculate the gravitational force along the ramp. Calculate the frictional force along the ramp. Is it enough to keep the block from sliding?

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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?”