1. Warm Up Activity 1.Pick up a poker chip from the teacher. 2.3 chips per team: 1 white, 1 blue, and 1 red per team. 3.Sit with your team members.

2. Warm Up Activity 4.Open your engineering notebook and title the page: Preliminary Challenge #21: Geared Mousetrap Car 5.Begin discussions about: The Design of the Traditional Mousetrap Car How to Use Gears to Transfer Power The Use of a Lever Arm to Create a Pulling Force

3. Share Out What ideas did your group discuss? How will your group use gears? How does a mousetrap car work?

4. Preliminary Challenge #21 Mousetrap Powered Gear Car

5. Science, Technology, Engineering, and Math Concepts Review

6. Momentum The quantity of motion of a moving body, measured as a product of its mass and velocity. Momentum = mass x velocity

7. Acceleration The rate of change of velocity of an object. Acceleration = (final velocity - initial velocity) ÷ time

8. Speed The rate at which someone or something is able to move or operate. Speed = distance ÷ time

9. Force A force is a push or pull upon an object resulting from the object's interaction with another object. Force = mass x acceleration

10. Weight A body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing. Weight = mass x gravity (9.8 m/s2 )

11. Work The product of a force applied, and the distance through which that force acts. Work = Force x distance

12. Power The amount of energy put out or produced in a given amount of time. Power = Work ÷ time

13. Friction The force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

14. Look at the next slide and think of what it reminds you of…

16. Gears

17. Gearing Mousetrap Cars Gearing is what determines how far and how fast a mousetrap racer will travel. Gearing is how you control the acceleration, the pulling force, the torque, and the travel distance of your mousetrap vehicle. With mousetrap powered vehicles the gearing is always the combination of the lever arm length and the axle to wheel ratio.

18. Gearing Mousetrap Cars As the string is pulled from the drive axle the mousetrap car is propelled by the turning of the drive wheels. It is the combination of the size of the wheels and the amount of string that is pulled from the drive axle that will determine how far the mousetrap vehicle is pulled by the force of the mouse trap. In most long-distance contest the objective is to propel a mousetrap car the longest possible linear distance. In this example the gearing will be set-up in such a way as to extend the mouse trap's energy over the longest possible distance.

19. Gearing Mousetrap Cars The length of the mouse trap's lever arm and the drive axle to wheel ratio will all determine the gearing and the performance of your mousetrap vehicle. Gearing is controlled by the following: the length of the lever arm the size of the drive wheel(s) the size of the drive axle

20. Engineering Design Process

21. Engineering Design Process (1-7) 1.Define The Problem 2.Brainstorm Possible Solutions 3.Research Ideas/Explore Possibilities 4.Specify Constraints And Identify Criteria 5.Consider Alternative Solutions 6.Select An Approach 7.Develop Written Design Proposal

22. Building Stage

23. Engineering Design Process (8-12) 8.Make Model/Prototype 9.Test And Evaluate 10.Refine/Improve 11.Create/Make Product 12.Communicate Results

24. Preliminary Challenge #21 Design Problem: Using the 12 step Engineering Process, design a vehicle that is powered by a gears and a mousetrap. The vehicle must carry one pound a minimum horizontal distance of twenty-five feet, or travel up a 30⁰ incline a minimum of ten feet.

25. The vehicle must carry one pound a minimum horizontal distance of twenty-five feet The vehicle must travel up a 30⁰ incline plane a minimum distance of ten feet 25 Feet or

26. Preliminary Challenge #21 Using the 12 step Engineering Process, design a vehicle that is powered by a gears and a mousetrap. Your choice of materials are: – Wheels – Cardboard – Hot Glue – Wood Dowel (1) – Gears (4) – Mousetrap (1) – Straws (3) – Paper – Wood/Metal Strips

27. http://www.docfizzix.com/topics/design- basics/MouseTrap-Cars/mousetrap- vehicles-gearing.shtml

28. Preliminary Challenge #21 Using the 12 step Engineering Process, design a vehicle that is powered by a gears and a mousetrap. The vehicle must carry one pound a minimum horizontal distance of twenty-five feet, or travel up a 30⁰ incline a minimum of ten feet. Steps 1 through 7 must be completed in your engineering notebook and checked by teacher. After steps 1 through 7 have been completed, the students will be given materials to complete the project. Your choice of materials are: – Wheels – Cardboard – Hot Glue – Wood Dowel (1) – Gears (4) – Mousetrap (1) – Straws (3) – Paper – Wood/Metal Strips

29. Preliminary Challenge #21