11. Which of the following situations shows the use of a pulley?
A. raising the flag
C. playing the seesaw
B. locking the doorknob
D. cutting strips of paper
12. A ramp is used for loading heavy boxes into a truck. What simple mach
ramp?
A. gears
B. inclined plane
C. lever
D. whec
13. Which of the following is NOT a type of simple machine?
A. pulley
B. screw
C. spring
D. wedge
14. Which of the following is a simple machine that uses a wheel and axle?
A. Clock
B. doorknob
C. nutcracker D. zigzag road
15. Which of these is an
example of a wedge?
A. skateboard
C. broom
B. stairs
D. butter knife​