A block rest on a horizontal board. the board is gradually tilted upward and the block just begin to slide when the angle of inclination is 21°, a. Find the coefficient of static friction between the block and the board. b. After the block starts moving it is found that it will keep sliding at constant speed when the angle tilt to 15°. Find the coefficient of kinetic friction. Draw the FBD

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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?”