1. Agenda for 5/13/16 Simple Machines Notes Classes of Levers worksheet
HW – None
TEST WEDNESDAY!

2. What is a Simple Machine?
Machine - a tool that helps us do work
A simple machine - has few or no moving parts.

3. Machines help us by:
Changing the amount of force on an object.
Changing the direction of the force.

4. The 6 Simple Machines Screw Wedge Inclined Plane Pulley Wheel and Axle
Lever

5. 1) Inclined Planes
An inclined plane – a slanted surface to make lifting easier
Ex. Ramp, stairs
A sloping surface, such as a ramp. An inclined plane can be used to alter the effort and distance involved in doing work, such as lifting loads. The trade-off is that an object must be moved a longer distance than if it was lifted straight up, but less force is needed. You can use this machine to move an object to a lower or higher place.  Inclined planes make the work of moving things easier.  You would need less energy and force to move objects with an inclined plane. 

6. 2) Wedges
Wedge - two inclined planes together used to raise an object or split an object
Ex. Knife, door wedge, axe, teeth

7. 3) Screws
A screw is an inclined plane wrapped around a pole that is used to hold materials together or drill holes
Ex. Drill bit, screws, lid of a PB jar, light bulb

8. 4) Wheels and Axles
Wheel and Axle – a wheel that turns on a post to help move things quickly and easily
Wheel and axle work together
Ex. Steering wheel, doorknob, screwdriver
Gears are a form of wheels and axles

9. 5) Pulleys
Pulley – a grooved wheel with rope, chain, or cable running along the groove
Can change direction of a force
Ex. Flagpole, clothesline, crane, fishing reel

10. Diagrams of Pulleys Fixed pulley: Movable Pulley:
A fixed pulley changes the direction of a force; however, it does not create a mechanical advantage.
Movable Pulley:
A movable pulley – a pulley in which one end of a rope is fixed and the wheel is free to move; increases the force

11. 6) Levers
Lever – a bar that is free to pivot or turn around a fixed point
The fixed point is called a fulcrum
Can be used to lift weight
Ex. Seesaw, crowbar, baseball bat, rake

12. Levers-First Class
First class lever - the fulcrum is in the middle and the load and effort is on either side
Think of a see-saw

13. Levers-Second Class
Second class lever - the fulcrum is at the end, with the load in the middle
Think of a wheelbarrow

14. Levers-Third Class
Third class lever - the fulcrum is again at the end, but the effort is in the middle
Think of a pair of tweezers

15. Which Simple Machine? Hammer Wrench Wedge Wheel and Axle
1st Class Lever

16. Which Simple Machine? Flag and Pole Screwdriver Pulley
Wedge, lever, wheel and axle

17. Which Simple Machine?
Staples
Paint roller
Wedge
Wheel and Axle

18. Which Simple Machine? Rope and pulley Paintbrush Pulley
2nd Class Lever

19. Which Simple Machine?
Ratchet
Doorknob
Wheel and Axle
Wheel and Axle

20. Which Simple Machine?
Saw
Light Bulb
Screw
Wedge

21. Compound Machines
Compound Machine - two or more simple machines working together.
Ex. Can Opener – The handles act as a lever, wedge pierces the can, and then crank the wheel and axle to open the can.

22. Rube Goldberg Machines
Rube Goldberg machines are examples of compound machines.
All compound machines are made up of combinations of simple machines.
Rube Goldberg machines are usually a complicated combination of simple machines.
By studying the components of Rube Goldberg machines, we learn more about simple machines

23. When you slip on ice, your foot kicks paddle (A),
Safety Device for Walking on Icy Pavements
When you slip on ice, your foot kicks paddle (A),
lowering finger (B), snapping turtle (C) extends neck
to bite finger, opening ice tongs (D) and dropping pillow (E),
thus allowing you to fall on something soft.

24. Awesome Rube Goldberg machines

25. Agenda for 5/16/16 Classes of Levers worksheet
Simple Machines Activity
Simple Machines Review Sheet
Work on Unit 7 Review Sheet
HW– Finish Unit 7 Review Sheet
TEST WEDNESDAY!

26. Which Simple Machine? Scissors Seesaw Wedge 1st Class Lever

27. Which Simple Machine? Drill Bit Crowbar Wedge 1st Class Lever Screw

28. Which Simple Machine? Shovel Car Jack Wedge Wheel and Axle
3rd Class Lever

29. Which Simple Machine? Wheelbarrow Rake Wedge 3rd Class Lever
Wheel and Axle
2nd Class Lever

30. Which Simple Machine? Forceps Pliers Wedge 1st Class Lever Wedge

31. Which Simple Machine?
Wheelchair
Putty Knife
Wedge
Wheel and Axle

32. Which Simple Machine?
Ferris Wheel
Wheel and Axle

33. Agenda for 5/16/11 Go over homework Go over Life Science Packets
Work on Unit 7 Review Questions – whatever you don’t finish is homework
Test on Wednesday