Simple Machines for 3rd graders

2. Simple
machines
• Tools that make
work easier

3. Lever
• A lever is a stiff bar that moves about a fixed point
• A lever is used to push, pull, or lift things

4. Screw
• Is an inclined plane wrapped around a cylinder or cone
• Common use is to hold objects together

5. Pulley
• A pulley is a wheel that has a rope wrapped around it
• Pulleys can be used to lift heavy objects by changing
the direction or amount of force

6. Wheel and Axle
• A wheel and axle consisted of a rod attached to a
wheel
• Makes it easier to move and turn things

7. Inclined Plane
• Flat surface that is rasied so that one end is higher than
the other
• Helps move heavy objects up and down

8. Wedge
• Wide at one end and pointed at the other to help split
or separate to objects

9. Group Project
• I will split the class up into 6 groups
• Group 1: Lever
• Group 2: Pulley
• Group 3: Wheel and axle
• Group 4: Inclined Plane
• Group 5: Wedge
• Group 6: Screw
• Your group will get together today and begin research on your specific
simple machine. I want you create a presentation that includes; a
definition, how it makes work easier, and examples from home and
school.

10. Next Step
• You will begin work today and for homework (referencing these slides
if needed) you will bring in or take pictures of examples of your
machine around your home.
• On Thursday, you will bring back these objects or pictures to show to
your group. As a group you will decide which examples to present to
your peers.
• Your presentations are on 11/11