Classes of Levers

Let's review our lesson on Simple Machines, particularly about Inclined Planes. Answer the given questions in each slide. You are given 2 minutes to type your answer to the question.

Draw

Give an example of an inclined plane found in a firetruck.

Draw

In your opinion, why do firetrucks use inclined planes for ladders?

Draw

What is the purpose of an inclined plane on the equipment storage of a firetruck?

Draw

Explain why inclined planes are helpful in moving items on and off a firetruck.

Multiple Choice

Check the pictures which shows examples of 1st class levers.

A wheelbarrow represents a second class levers. The effort is applied at the end of the handle by the gardener. The fulcrum is at the wheel – at the opposite end of the handle. The load is carried in the wheelbarrow bucket.

​Why is a wheelbarrow considered a 2nd class lever?

Draw

Draw an example of a second class lever

​ A hockey stick is a great example of a third class lever. You may want to ask students where they should place their hands when swinging at a hockey puck. Have one student demonstrate how they would swing a stick – use a meter stick or a broom. Point out that to get the most power (or work) from swinging the stick, the top hand should be stationary and the bottom hand pushes. A hockey player often pushes the puck along by moving both hands, but for long shots the top hand is stationary and acts as the fulcrum. The answer to the question for the third class levers is: “the effort is in the middle of the system.” The fulcrum for the tongs is where the two ends are attached, the effort is in the middle and the load is the serrated ends.

Multiple Choice

Check the picture which shows an example of 3rd class levers.

Activity Time!

Problem: What are the characteristics of a lever?
What you need:
bottle opener broom spoon
tongs clothespin pliers
scissors tweezers

​What you need to do:
1. Take a look at the different objects. Use each to identify the fulcrum, load
or resistance, and the effort. Answers will be drawn on the next slide.

​	​LOCATION OF FULCRUM	​LOCATION OF LOAD	​LOCATION OF EFFORT	​TYPE OF CLASS
​ex: wheelbarrow	​wheel	​tray/bucket	​handle	​2nd class
​1. bottle opener	​	​	​	​
2.tongs​	​	​	​	​
3.scissors​	​	​	​	​
4.clothespin​	​	​	​	​
5.broom​	​	​	​	​
6. spoon​	​	​	​	​
7.pliers​	​	​	​	​
8.tweezers​	​	​	​	​

Draw

Label the fulcrum, load and effort of the bottle opener. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Draw

Label the fulcrum, load and effort of the tong. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Draw

Label the fulcrum, load and effort of the picture. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Draw

Label the fulcrum, load and effort of the picture. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Draw

Label the fulcrum, load and effort of the picture. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Draw

Label the fulcrum, load and effort of the picture. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Draw

Label the fulcrum, load and effort of the picture. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Draw

Label the fulcrum, load and effort of the picture. Draw your answer on the illustration. Write also the class of lever that the image belongs to.

Open Ended

Describe a fulcrum.

Open Ended

Differentiate first, second and third class levers.

Open Ended

What are the different kinds of levers and how do they differ?

Open Ended

How are levers helpful in our activities in Physical Education?

​You may now answer the quiz given. Good luck and God bless!!