Question

1. which of the following describes a screw?

a lever without a pulley
a wedge against a cylinder
an inclined plane wrapped around a cylinder
an axle without a wheel

Explanation:

To determine the correct description of a screw, we recall the definition of a screw as a simple machine. A screw is an inclined plane wrapped around a cylinder. Let's analyze each option:

• "A lever without a pulley" is incorrect as a screw is not related to levers or pulleys in this way.
• "A wedge against a cylinder" is incorrect; a screw is not a wedge against a cylinder.
• "An inclined plane wrapped around a cylinder" matches the definition of a screw.
• "An axle without a wheel" is incorrect as it describes a different simple machine component.

Answer:

C. An inclined plane wrapped around a cylinder (assuming the options are labeled A, B, C, D with C being "An inclined plane wrapped around a cylinder")