A mass m1 hangs from one end of a string passing over a frictionless, massless pulley. A second frictionless, massless pulley hangs from the other end of the string. Masses m2 and m3 hang from a second string passing over this second pulley. Find the acceleration of the three masses, and the tension in the two strings.

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Q: An astronaut at rest on Earth has a heartbeat rate of 71 beats/min. When the astronaut is traveling…

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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?”