Which of these is not a simple machine?
A.
Lamp
B.
Lever
C.
Screw
D.
Wedge
A. Lamp
The correct answer is A. Lamp. A lamp is not considered a simple machine.
To determine which of these is not a simple machine, we can first understand what simple machines are. Simple machines are basic mechanical devices that do not have moving parts and are used to perform work or change the direction of a force. They are considered the building blocks of more complex machines.
Now, let's analyze each option:
A. Lamp: A lamp is not typically considered a simple machine. It is an electrical device used for providing light, and it does not perform work by utilizing mechanical principles.
B. Lever: A lever is a simple machine consisting of a rigid bar that rotates around a fixed point called a fulcrum. It can be used to increase force or change the direction of a force.
C. Screw: A screw is also a simple machine. It is a rotating inclined plane wrapped around a cylinder-shaped object. Screws are commonly used to hold objects together by applying rotational force.
D. Wedge: Similarly, a wedge is a simple machine. It is an inclined plane with one or two sloping sides used to split, tighten, or secure objects.
Based on this analysis, the answer is A. Lamp. The lamp is not a simple machine.