Which one of the following is NOT a simple machine?

Which description does the phrase

Why are all machines NOT 100% efficient?

What makes simple machines useful for people without enough strength to complete a task?

How can the mechanical advantage of an inclined plane be expressed as a ratio?

Wedges are used to ____________ things.

Which of these items is NOT a wedge?

What form of simple machine is a hammer?

A screw is most closely related to a _____________.

When using a lever, what is the input force called?

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