Question

Which of the following is not a simple machine?

• A. knife
• B. crowbar
• C. a pair of scissor
• D. paper

Answer 1

The correct option is D

paper

Explanation for the correct option(s)

1. Simple machines are made of very few parts that simply change the direction and the magnitude of force or help us to work faster.
2. Simple machines need energy or a power source to work.
3. Paper is used for writing work, it is not used to change the direction and the magnitude of a force or help us to work faster.
4. Hence, Paper is not a simple machine.

Explanation for the incorrect option(s)

1. A knife is a wedge-type simple machine.
2. Crowbar is a lever type simple machine.
3. A pair of scissors is a compound simple machine.

Hence, option D is correct.