1. Levers For Mrs. Berg’s Science Class

2. A lever consists of a rod or bar that rests and turns on a support called a fulcrum . effort resistance

3. A force of effort is applied at one end of the rod to lift a load placed at the other end. A lever can help lift a weight with less effort. effort resistance fulcrum

4. Prying something loose with a crowbar is using a lever. Some machines, such as a catapult, use a lever to hurl objects.

5. Here is a catapult you could make.

9. First Class Lever Second Class Lever Third Class Lever

14. An example in the human body of a second-class lever is the Achilles tendon , pushing or pulling across the heel of the foot.

15. An example of a third-class lever in the human body is the elbow joint : when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.

16. First Class Lever Second Class Lever Third Class Lever

22. beam bar rod board

23. rotate Turn

24. effort Resistance / Load fulcrum

25. work

26. friction

27. Mechanical Advantage