4 I. Relating work, force, and displacement A. The figure at right shows a hand pushing a block as it moves through a displacement AS. Direction of original force Aš 1. Suppose instead the force exerted by the hand were directed partially downward as shown. Both the displacement of the block and the magnitude of the force are the same as before. Direction of Would the work done by the new force be greater than, less than, or equal to the work done by the original force? Explain. new force 2. Suppose instead that the hand were to push with a force of the same magnitude as before but do zero work. The displacement of the block is the same as before. In the space at right, draw an arrow to show the direction of the force by the hand. Displacement Force on block of block by hand

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Q: Initial Angular Momentum (J-s)

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.