A hollow ball (1 = 23 MR2) with a mass of 0.934 kg is released from rest and slides down a hillside that slopes downward at 56.0° from the horizontal. What minimum value must the static friction force between the hill and ball surfaces be for no slipping to occur? 1.18 N 1.29 N 2.06 N 2.25 N 3.04 N 3.32 N None of the above

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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?”