19. Which of the following describes the way to use the wheel and axle?
A. To use a wheel and axle, you pull the wheel away from the axle.
B. To use a wheel and axle, you either push or pull the axle.
C. To use a wheel and axle, you provide the effort by pressing the wheel or
the axle.
D. To use a wheel and axle, you provide the effort by turning either the
wheel or the axle,
20. Which of the following is the use of inclined plane?
A. It lessens the effort exerted in transporting weight over a distance and
height
B. To lift an object easier by changing the direction of the effort force
C. To deliver a person from high area to low area
D. To deliver a person from low area to high area​