Answer:

4. in which of the following situations is wedge most useful?

A. raising cargoes

B. opening bottle

C. lifting heavy objects

D. splitting hard objects

5. which of the following kinds of lever would describe a seesaw

A. first-class lever

B. second-class lever

C. third-class lever

D. all of these

6. in which situation is pulley most useful

A. cutting meat

B. raising flag

C. holding a piece of wood together

D. helping guide the sail on a sailboat

7. which of the following helps people do work which requires less effort ?

A. device

B. equipment

C. gear

D. simple machines

8. during flag ceremony, John is in charge of raising the flag. the simple machine John uses to raise flag is called ____.

A. lever

B. pulley

C. inclined plane

D. wedge