Momentum Conservation on the Pool Table

Momentum Conservation on the Pool Table - Momentum...

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Momentum Conservation on the Pool Table As a warm-up exercise, let us consider conservation of momentum for a collision of two balls on a pool table. We draw a chalk line down the middle of the pool table, and shoot the balls close to, but on opposite sides of, the chalk line from either end, at the same speed, so they will hit in the middle with a glancing blow, which will turn their velocities through a small angle. In other words, if initially we say their (equal magnitude, opposite direction) velocities were parallel to the x -direction—the chalk line—then after the collision they will also have equal and opposite small velocities in the y -direction. (The x -direction velocities will have decreased very slightly). A Symmetrical Spaceship Collision Now let us repeat the exercise on a grand scale. Suppose somewhere in space, far from any gravitational fields, we set out a string one million miles long. (It could be between our two clocks in the time dilation experiment). This string corresponds to the chalk line on the pool
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Momentum Conservation on the Pool Table - Momentum...

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