1. January 3, 2008 DRILL Output = 320 miles Input = 32 gallons
U3d-L2
January 3, 2008
DRILL
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)?
F x d = W
50 lbs x 9 ft =
W = 450 ft-lbs.
2004 Hummer H2
Output = 320 miles
Input = 32 gallons
Efficiency = ?
Toyota Prius
Output = 500 miles
Input = 10 gallons
Efficiency = ?

2. DRILL (continued) Output = 320 miles Input = 32 gallons Efficiency = ?
U3d-L2
DRILL (continued)
2004 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

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

4. SIMPLE MACHINES 1. COMPONENTS: Levers Pivot Points Linkage Joints
U3d-L2
SIMPLE MACHINES 1.
COMPONENTS:
Levers
Pivot Points
Linkage Joints
COPY THIS INTO #1
INPUT

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

6. U3d-L2
SIMPLE MACHINES
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.

7. U3d-L2
SIMPLE MACHINES
input
input 2. 3.

8. U3d-L2
SIMPLE MACHINES
input 4.
input 5.

9. U3d-L2
SIMPLE MACHINES 6.
input

10. U3d-L2
SOLUTIONS
input
input
input 2. 3. 4.
input
input 5. 6.

11. U3d-L2
SIMPLE MACHINES 2.
input
input

12. U3d-L2
SIMPLE MACHINES
input
input 3.

13. U3d-L2
SIMPLE MACHINES
input
input 4.

14. U3d-L2
SIMPLE MACHINES 5.
input
input

15. U3d-L2
SIMPLE MACHINES 6.
input
input

16. U3d-L2
MACHINES
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