7. Which does not describe a wedge?

A. It consists of two inclined planes back to back

B. It has sharp edge and a base

C. It is used to cut things or split things apart

D. It is used to transfer a heavy load to a higher place

8. A simple machine is any device that makes work easier and faster by reducing the effort or force used in doing work. This is statement is__________.

A. False

B. True

C. Maybe

D. None of the above

9. What simple machine is needed when you open a bottle of vinegar?

A. Screw

B. Lever

C. Wedge

D. Pulley

10. A doorknob is an example of_______.

A. Screw

B. Wheel and axle

C. Lever

D. Pulley​