What is an inclined plane?

What is a ramp?

What is a wedge?

What is a screw?

What does a ramp do?

What is a pitch?

What are wedges used for?

What are some examples of wedges?

List some examples where zips can be found:

What does a zip consist of?

How many wedges does the zipper slide consist of?

What are the three wedges?

What is a screw designed to do?

What do wood screws do?

What are boat propellers?

What are aircraft propellers?

What does a screw with a small pitch do?

What does a screw with a large pitch do?

What does the screwdriver do?

What is a thread?