1. Elastic Powered Vehicle

2. Design Brief b The design brief of this project is to design and construct an elastic powered vehicle that will travel the greatest distance in a straight path.

3. Vehicle Systems b All Vehicles have common systems StructureStructure SuspensionSuspension Guidance & ControlGuidance & Control PropulsionPropulsion

4. Structure b Structure: The physical frame and/or covering, which provide for spaces for people, power and control systems, and other devises (Chassis)

5. Chassis Limitations b Length: 11” Maximum 7” minimum b Width 3.5” maximum 2” minimum Shown without wheels and axles

6. Suspension (wheels and Axles) b Suspension Axles : Provides proper support for the structure and all other components within the vehicle. (wheel and axles)

7. Suspension (wheels and Axles) b Drive Axles: Acts as a suspension axle and provides power to the axle through a gear system Drive Axle

8. Suspension Limitations b Must have two axles: 1 suspension axle and 1 drive axle1 suspension axle and 1 drive axle Or 2 drive axles (4x4)Or 2 drive axles (4x4) Suspension or Drive Axle

9. Suspension Limitations b Axles must be at least ¾” away from the edge of the body/chassis. ¾”

10. Wheels b Size 1.5” Minimum Max –(What will fit on the car) b Width: Thickness if material b Number 4 Maximum 3 Minimum

11. Guidance & Control b Guidance & Control: The process of information (via the operator) for the control of the vehicles direction, speed, and location.

12. Guidance & Control Limitations b Wheel Alignment Provides guidance Makes the car go straight Straight wheels go forward Wheels shifted right will make the car go right

13. Propulsion b Propulsion: The unit or method of force to propel the vehicle from the start to its final destination (energy to produce power and motion)

14. Propulsion Limitations b The rubber band must be able to wrap around the axle in order to turn it when its released. An opening (Drive Port) is created to give us access to it. Length: 1.5” minimumLength: 1.5” minimum Width: 1” MinimumWidth: 1” Minimum 1” 1.5”

15. Propulsion Limitations b A nail is inserted through the drive axle to give the rubber band something to grip onto Nail!

16. Miscellaneous Limitations b Anchor and Catch: Posts used as an anchor point for the rubber band, and a point to stp the rubber band from flying off the car. Must be centered on the bodyMust be centered on the body Must be ¾” – 1’ above the chassisMust be ¾” – 1’ above the chassis Anchor Catch

17. Science and Math Connections and Considerations b Weight: The more the car weighs, the more energy it will take to get it to move! Newton’s first law of motion says that an object at rest tends to stay at rest. An object in motion tends to stay in motion, in the same direction and speed. speed

18. Science and Math Connections and Considerations b Energy Potential & Kinetic Energy from elastic qualities of the rubber bandPotential & Kinetic Energy from elastic qualities of the rubber band Conservation of Energy: Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes. Conservation of Energy: Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes. –ie… the amount of energy available to move the car will be dependent on how much is left overcoming inertia and friction. If the effects of those forces are reduced, the more energy there is to prpel the car!!

19. Science and Math Connections and Considerations b Solid Friction: the force that opposes the relative motion or tendency of such motion of two surfaces in contact, whose by product is heat. The tighter the objects are held together, the more energy is needed to move them, even thought the energy to move the objects remain the same. Why? –Greater friction force to overcome –Additional used to overcome friction is transformed into heat. (rub your hands together)

20. Science and Math Connections and Considerations Locations of solid friction and ways to reduce them Wheel to body: ¼” clearance from Tire to the edge of car Axle to Body: give axle room to move (clearance), Lubrication, and bearings. 5/16” hole with a straw sleeve to create a bearing

21. Science and Math Connections and Considerations b Friction that should not be eliminated….. TRACTION!

22. Science and Math Connections and Considerations b Wheel to Axle Ratios Wheels and axles are simple machinesWheels and axles are simple machines –Increasing force or distance of motion depending on where the effort is applied. Changing the diameter of either the wheel(s) or the axle controls the mechanical advantage of a wheel-axle system.Changing the diameter of either the wheel(s) or the axle controls the mechanical advantage of a wheel-axle system.

23. Science and Math Connections and Considerations Speed Multiplier Distance Multiplier axleAxle

24. The End