10. How is the mechanical advantage of a machine computed?
A. By dividing the input force by the output force
B. By dividing the output force by the input force
C. By multiplying the input voice by the output force
D. By multiplying the output force by the input force

11. Which of the following is applied on the machine?
A. Effort
B. Fulcrum
C. Lift
D. Resistance

12. What kind simple machine is a screw?
A. Inclined plane
B. Lever
C. Pulley
D. Wedge​