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We continue with Wedges in this lesson


Language Arts, Math, Science, Social Studies  


3, 4  

Title – Simple Machines Unit Lesson 7
By – Debbie Haren
Subject – Math, Science, Social Studies, Language Arts
Grade Level – 3/4

Simple Machines Unit Lesson 7:


How Does a Wedge help us work?

A double wedge is two inclined planes put together. IT is used to spread things apart or raise an object. Can you think of anything that does this? What do we use to keep our door open? Is it a wedge? (yes)

Which block of wood would you use to keep a door open? A slanted piece that has an inclined plane or a piece of wood that it just a rectangle?


Have students write the answers to these questions in their journals. How does a wedge under the door work? How does a butter knife work as a wedge? Can it get under things and pull them apart? Is a tack a wedge? Yes it is because it keeps something up or open.


Do wedges move under objects to pull them apart or keep them open? How does a wedge help us work?
Can you see the wedge in such objects as a hammer, scissors, and a saw at home? Do this for homework. How do they help us work faster and easier? Write this down for homework.

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