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What do you call an inclined plane that wraps around a spiral rod?
This is a simple machine called a screw.
Non-intersecting lines in different planes are?
They are called skew lines. Explanation: In 3 space, parallel lines must never intersect AND must be in the same plane. If they fail to intersect and are in different planes we call them skew lines.
What do you call a twisted circle?
I believe your are talking about a 3D figure called a Mobius strip. It is a strip of paper that has a half-turn in it that causes technically a one sided figure.
What solid has 2 flat faces that are circles and 1 curved side?
A cylinder, yep. Actually lots of other things too, depending on what you call a single curved side. Any two (non-intersecting) planes through a sphere make a "fat cylinder." Think of others, there's more.
Why is the actual mechanical advantage of an inclined plane alwaysess than the theoretical mechanical advantage?
This is because the actual mechanical advantage is the actual calculation found after dividing the effort force by the output force. Ideal mechanical advantage is what many people would call an estimate. When estimating mechanical advantage, the numbers are always rounded. This makes actual mechanical advantage less. Sources: Science teacher
