A student repeats your lab but uses a penny and a book (instead of a washer and wooden ramp). Their data is: length of incline (book):  23 cm initial velocity: 0 m/s Angle of incline (book):  35o  Times to slide down, 0.36, 0.36, 0.38, 0.36, 0.34 seconds What is the coefficient of KINETIC friction for the penny and book interface? Give your answer to 2 significant figures (2 decimal places)

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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?”