Which of the following is an example of a lever?
A. knife
B. screw
C. nutcracker
D. pencil sharpener

I think it's either A or B

Question

Which of the following is an example of a lever?
	A.	knife
	B.	screw
	C.	nutcracker
	D.	pencil sharpener

I think it's either A or B

anonymous · Answer

A

chris · Answer

I agree with Jose - levers are a single bar and pivot point

chris · Answer

A nutcracker is a "double" lever

anonymous · Answer

Seriously? We are splitting hairs here? A knife is a wedge first of all. A screw is an inclined plane, and a pencil sharpener is a wedge and if one of those fancy ones, it has gears. 

The answer is definitely nutcracker.

chris · Answer

hmmm, I don't understand why a knife is not a lever - I suppose it depends on how it is used.

chris · Answer

see your point on nutcracker clearly being a lever though.

chris · Answer

bah, I think you're right

chris · Answer

knife is two incline planes

chris · Answer

i.e. wedge

anonymous · Answer

What is the main function of a knife? To cut right? The simple machine that cuts is the wedge. Because we are evolutionary creatures, we have figured out that we can cut with more power if we use the knife in a lever fashion. Albeit, a knife is a wedge at its core.

chris · Answer

yep =) I think you're right. Just found this resource that backs it up: http://www.edheads.org/activities/simple-machines/glossary.shtml