In the figure above, if the fulcrum supporting the lever is moved closer to the cat, the cat will be ___________.
Answer(s): C
If the fulcrum is moved closer to the cat, the length of the effort arm of the lever will be increased, making the cat easier to raise, but the height to which the cat can be raised will be reduced.
The mechanical advantage of the block-and-tackle arrangement shown above is _________.
Answer(s): A
Because this block-and-tackle arrangement merely changes the direction of the pull, it has a mechanical advantage of only 2.
In the figure above, if the cogs move up the track at the same rate of speed, Cog A will __________.
The larger cog (Cog A) covers a greater linear distance in a given period of time.
If a house key, a wooden spoon, a plastic hanger, and a wool jacket are all the same temperature, which one feels the coldest?
Answer(s): B
The key will feel coldest because metal is a better conductor than the other materials.
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