1. Work and Machines An investigation…

2. Work and Machines Purpose: To examine the mechanisms of simple machines and the effect they have on work. (AKS 15)Purpose: To examine the mechanisms of simple machines and the effect they have on work. (AKS 15) Answer the following previewing questions:Answer the following previewing questions: –What does it mean to do work? –What is a machine? –What are some examples of machines? –How are machines helpful when doing work?

3. Work and Machines Challenge 1:Challenge 1: –Sketch and label as many parts of the wheelbarrow as you can. Be as detailed and specific as possible! –Using a different color add the following words to your labels. DO NOT change any of the words you have already written! Inclined plane WedgePulley Wheel and axle LeverScrew Inclined plane WedgePulley Wheel and axle LeverScrew

4. Work and Machines Challenge 1:Challenge 1: –Draw and label the six simple machines found in your basket. –HINT: Be creative about how you use your materials! Inclined plane WedgePulley Wheel and axle LeverScrew Inclined plane WedgePulley Wheel and axle LeverScrew

5. Work and Machines A machine is a device that helps make work easier.A machine is a device that helps make work easier. What does it mean to do work?What does it mean to do work? –Work occurs when: An object moves when force is applied.An object moves when force is applied. The direction of motion is the same as the direction of force.The direction of motion is the same as the direction of force. –See p. 189 for examples. –So… work is when a force causes an object to move in the direction of the force.

6. Work and Machines Copy and complete the following table.Copy and complete the following table. Machine 2 Characteristics 2 Examples 1 Illustration

7. Work and Machines Levers Levers

8. Work and Machines Inclined Plane Inclined Plane

9. Work and Machines Wedges Wedges

10. Work and Machines Screws Screws

11. Work and Machines Wheel and axle Wheel and axle

12. Work and Machines Pulleys Pulleys

13. Work and Machines MachinesMachines –What do all of these machines have in common? They all make work easier by changing the size and/or direction of a force.They all make work easier by changing the size and/or direction of a force. –What do you end up with if you combine 2 or more simple machines?

14. Work and Machines Compound MachinesCompound Machines –A compound machine is made of 2 or more simple machines. Are scissors simple or compound machines?Are scissors simple or compound machines? How many simple machines can you identify in this pair of scissors?How many simple machines can you identify in this pair of scissors? Lever Wedge Fulcrum

15. Work and Machines Compound MachinesCompound Machines –Challenge 6: Design a compound machine that uses all 6 simple machines. Be sure to label the simple machines you use!Be sure to label the simple machines you use! –www.edheads.org www.edheads.org

16. Work and Machines