Question

which statement describes a compound machine? it has movement in only one direction. it makes work more difficult. it can only be acted on by one force. it is made up of more than one simple machine.

Explanation:

A compound machine is defined as a machine that is composed of two or more simple machines. Simple machines are basic mechanical devices like levers, pulleys, etc. Let's analyze each option:

• A machine (whether simple or compound) can have movement in multiple directions depending on its design. So, the statement "It has movement in only one direction" is incorrect.
• Machines (including compound machines) are designed to make work easier (by changing the magnitude or direction of the force), not more difficult. So, "It makes work more difficult" is wrong.
• A compound machine (or any machine) can be acted on by multiple forces. For example, a seesaw (a lever - a simple machine) has the force of a person sitting on one end, the force of another person on the other end, and the force of gravity acting on it. So, "It can only be acted on by one force" is incorrect.
• By the very definition of a compound machine, it is made up of more than one simple machine. For example, a wheelbarrow is a compound machine made up of a lever (the handles) and a wheel and axle (the wheel part).

Answer:

It is made up of more than one simple machine.