Which two things make up a pulley?
A.
A handle and a screw.
B.
A screw and a wheel.
C.
A wheel and a rope.
D.
A rope and a handle.
C. A wheel and a rope.
C. A wheel and a rope.
To determine the correct answer, let's break down the components of a pulley:
A pulley is a simple machine that consists of a wheel and a rope (or a chain or a belt). The wheel is known as the "sheave," and the rope is threaded through the groove around the wheel.
Now let's look at the options provided:
A. A handle and a screw: This combination does not represent the components of a pulley. A handle and screw are typically associated with different types of tools.
B. A screw and a wheel: Although a wheel is one of the components of a pulley, a screw is not. Screws are used for fastening or as an inclined plane.
C. A wheel and a rope: This option matches the correct components of a pulley. The wheel (sheave) and the rope (or chain or belt) are the necessary components for a pulley.
D. A rope and a handle: While a rope is essential for a pulley, a handle is not a necessary component. Handles are often used for operating various tools, but not specifically for pulleys.
Based on the above analysis, the correct answer is C. A wheel and a rope make up a pulley.