What is this?

Cam and Follower
Lead Screw
Bevel Gears
Rack and Pinion

We have a test on this in 10 minutes and we get this time to finish studying but I have NO IDEA WHAT THIS IS. Please help :D

What is this Cam and Follower Lead Screw Bevel Gears Rack and Pinion We have a test on this in 10 minutes and we get this time to finish studying but I have NO class=