19. How can machines make work easier?

A. Applying force and the object’s motion in the same direction.
B. Changing the direction or the size of the force needed to do work.
C. Decreasing the amount of force you apply on a certain task.
D. Increasing the amount of force you apply on a certain task.

20. Why is it necessary to use simple machine in our everyday tasks?

A. Machines decrease the amount of force you apply in a certain task.
B. Machines need greater effort force but has a decreased output force.
C. Machines increase the amount of force you apply on a certain task.
D. Machines help us do more with much effort.