Download PDF by Benjamin Crowell: 8-Conceptual Physics

By Benjamin Crowell

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Answer, p. 3 Momentum Conservation of momentum Let’s return to the impossible story of Jen Yu and Iron Arm Lu on page 39. For simplicity, we’ll model them as two identical, featureless pool balls, a. This may seem like a drastic simplification, but even a collision between two human bodies is really just a series of many collisions between atoms. The film shows a series of instants in time, viewed from overhead. The light-colored ball comes in, hits the darker ball, and rebounds. It seems strange that the dark ball has such a big effect on the light ball without experiencing any consequences itself, but how can we show that this is really impossible?

In fact, the earth wobbles in a little “orbit” about a point below its surface on the line connecting it and the moon. The two bodies’ momenta always point in opposite directions and cancel each other out. The earth and moon get a divorce example 8 Why can’t the moon suddenly decide to fly off one way and the earth the other way? It is not forbidden by conservation of momentum, because the moon’s newly acquired momentum in one direction could be canceled out by the change in the momentum of the earth, supposing the earth headed the opposite direction at the appropriate, slower speed.

The force F is barely capable of lifting a weight m if F = mg, and if it does this, then the upward force from the cable exactly cancels the downward force of gravity, so the weight will rise at constant speed, without changing its kinetic energy. Only gravitational energy is transferred into the weight, and the amount of gravitational energy is mgd, which equals F d. By conservation of energy, this must also be the amount of energy lost from the 8 “Black box” is a traditional engineering term for a device whose inner workings we don’t care about.

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8-Conceptual Physics by Benjamin Crowell


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