0.     Objective

1)Lever, 2)pulley

1.     Definition

1) It is a tool that uses a rod to transmit force.

2) A pulley is a device that hovers a rope or chain on a home pinwheel and lifts or pulls it.

2.     Scientific definition

    1) A device that supports a point on a rod and moves the object around its fulcrum.

     2) A device that changes the direction of a force or exerts a large force with a small force.

3.     Solving Problems

      We can gain from strength but you can’t benefit from work because you have to move as much distance as you need a little strength.

4.     Scientific terms

1)     돌림힘(torque), 1종,2종3종지레(One type of lever, two types of lever. Three point level) 받침점(supporting point), 힘점(power point), 작용점(point of action)

2)     고정 도르래(fixed pulley) 움직 도르래(moving pulley)

5.     Other Information

거중기(conventional machine used to lift heavy objects, designed by Dasan Jeong Yak Yong. 

It was made using the principle of pulley, and eleven troopers built directly in the royal family were used for the Suwon construction)

6.     Think and Discuss