1. You have a dog that weighs 50 pounds. You carry her up the stairs a total vertical height of 9 feet. How much work did you do (keep all units)? December 3, 2009 DRILL U3d-L Hummer H2 Output = 320 miles Input = 32 gallons Efficiency = ? Toyota Prius Output = 500 miles Input = 10 gallons Efficiency = ? F x d = W 50 lbs x 9 ft = W = 450 ft-lbs.

U3d-L2 DRILL (continued) Hummer H2 Output = 320 miles Input = 32 gallons Efficiency = ? Toyota Prius Output = 500 miles Input = 10 gallons Efficiency = ? Wo / Wi = Eff 320 mls / 32 gal = Eff = 10 mpg Wo / Wi = Eff 500 mls / 10 gal = Eff = 50 mpg

U3d-L1 On a clean sheet of notebook paper, use a pencil to draw 6 2” x 2” squares equally spaced. Number them. SIMPLE MACHINES VERY LIGHT Construction Line 2” 1” 2” 1.5”

CONSTRAINT : You can use only the following system components: –Levers –Pivot Points –Linkage Joints GOAL: Transmit the given input motion to the desired output motion. U3d-L2

1. COMPONENTS: –Levers –Pivot Points –Linkage Joints INPUT COPY THIS INTO #1

What is the GOAL? –Transmit the given input motion to the desired output motion. What is the CONSTRAINT? –Y ou can use only the following system components: Lever Arms Pivot Points Linkage Joints U3d-L2

With a partner, you must create two solutions to each of the following problems. Then, identify common mechanical devices that exhibit characteristics similar to either of the mechanisms you have created. U3d-L2

2. input 3.

U3d-L input

6. input U3d-L2

input U3d-L2

2. input U3d-L2

input 3. U3d-L2

4. input U3d-L2

5. input U3d-L2

input 6. input U3d-L2

Machines are artifacts that transmit or change the application of power, force, or motion. What is an artifact? –something created by humans usually for a practical purpose. Machines can be simple or complex –Complex machines are comprised of…. Simple Machines