DATE:
NAME:
Science 8
Mechanical Systems
CLASS:
Topic 1
Review
Reviewing Levers
Using your understanding of the different classes of levers, complete this worksheet
Part A: Identify
Identify the classes of each lever shown below. On each diagram, label the Effort (E), the Load (L),
and the Fulcrum (F).
L
L
L
1
Class __________
3
Class __________
2
Class __________
1
Class __________
3
Class __________
E
F
L
1
Class __________
L
E
E
F
L
E
L
F
F
3
Class __________
1
Class __________
2
Class __________
E
L
F
L
L
E
E
F
F
Class __________
3
Class __________
3
Class __________
2
Part B: Short Answer
1. What are the three elements of a lever?
Effort, Load, Fulcrum
2. Write a definition for each of the following:
a) Effort Force – the force that is applied to the machine
b) Load – the resistance to the force (what you’re trying to move or overcome)
c) Fulcrum – the pivot or central point in a machine
3. How can a person determine what class a lever is?
Based on what element is in the middle (in between the others)
4. In second-class levers, the ___load___ is between the effort and the ___fulcrum___
5. In ___first___-class levers, the load and effort are moving in opposite directions.
6. When the effort is between the fulcrum and the load, it is a ___third___-class lever.
7. What kind of advantages are you gaining when you use each of the different types of levers?
a) First-class – force, speed, change in direction
b) Second-class – force
c) Third-class – speed