19. Your father joined the brigada as volunteer. The task of removing paint from an old chair has
been assigned to your father. What machine would you recommend to your father as the best
choice for this task?
A. screw
B. wedge
C. wheel and axle
D. class three level
20. You want to hang a picture of your family on the wall. How would you put a picture on a wall
with a simple machine?
A. by using a screw
B. by employing a wedge
C. by using an inclined plane
D. making use of a wheel and axle​