Although people would surely avoidgetting into the elevator with you, suppose that you wiegh yourself while on an elevator that is moving. Would you weigh more than, less than, or the same as when the scale is on a stationary floor? In fig.ą, a passenger of mass m 72.2 kg stands on a platform scale in an elevator cab. We are concerned with the scale readings when when the cab is stationary and when it is moving up or down. (a) find a general solution for the scale reading, whatever the vertical motion of the cab. (b)what does the scale read if the cab is stationary or moving upward at a constant 0.50 m/s?

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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?”