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MESA Mouse Trap Powered Cars. Basic Competition Rules Greatest distance travelled without leaving 6-foot wide track Zero alteration of mousetrap – do.

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Presentation on theme: "MESA Mouse Trap Powered Cars. Basic Competition Rules Greatest distance travelled without leaving 6-foot wide track Zero alteration of mousetrap – do."— Presentation transcript:

1 MESA Mouse Trap Powered Cars

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3 Basic Competition Rules Greatest distance travelled without leaving 6-foot wide track Zero alteration of mousetrap – do not take the spring apart – do not drill holes in or paint the trap except screw attachment holes – trap lock must be working and sprung with a pencil or similar object

4 Basic Car Design

5 Advanced Car Design

6 Physics of Mousetrap Car Friction forces DragAccelerationTorqueMomentum

7 Friction Rubbing forces on moving parts Effect: slows car and prevents maximum distance Caused by: – excess wheel to road contact – poor wheel alignment – various parts rubbing when in motion

8 Wheel to road contact Skinny wheels incur less friction than wide wheels total surface area of all wheels

9 Skinny Wheels Skinny Wheels work best

10 Poor Wheel Alignment Axles should be aligned perpendicular to car; if not, Cars veers to right of left Excess friction between front and back axles

11 Moving parts rubbing Axles rubbing on car body Axles rubbing on mounting screws or holes Lever arm against body String against body or axle Wheels against body

12 Drag Anything that slows or stops the car Such as: Friction Parts hanging off car Wide lever arm or wheels

13 Acceleration Getting the car moving with trap Strongest possible residual strength in mouse trap Optimum lever-arm to car length ratio (also consider trap position) Too long or short of lever arm reduces potential acceleration Friction reduces acceleration

14 Torque Getting power to the wheels: ability to get car moving Getting power to the wheels: ability to get car moving Too much torque = less distance (wheel spin) Too much torque = less distance (wheel spin) Too little torque = car will not move Too little torque = car will not move Torque altered by changing power arm angle to axle Torque altered by changing power arm angle to axle Firm string to axle attachment Firm string to axle attachment

15 Momentum Keeping the car moving after acceleration phase Keeping the car moving after acceleration phase less friction = greater distance less friction = greater distance the heavier the car, the greater the momentum the heavier the car, the greater the momentum

16 Long vs Short Car Long Cars: Long Cars: less torque less torque less speed less speed less momentum less momentum much longer acceleration period much longer acceleration period Short Cars: more torque more torque greater speed greater speed more momentum more momentum shorter acceleration period shorter acceleration period

17 Long Car

18 Short Car

19 Maximizing distance longest power arc (arm length) longest power arc (arm length) ideal torque ideal torque (mousetrap position) largest wheel diameter (greatest distance per wheel revolution) largest wheel diameter (greatest distance per wheel revolution) smallest axle diameter (most revolutions per inch of string) smallest axle diameter (most revolutions per inch of string)

20 2009 Long Arm

21 Large Wheel Diameter

22 Large Diameter wheels Small Diameter Axles

23 Comes Down to Car with trap not modified trap not modified least amount of friction least amount of friction maximizes design acceleration capability maximizes design acceleration capability finds ideal torque for design finds ideal torque for design most possible momentum most possible momentum stays on the track stays on the track

24 Summary: Building Tips Large drive wheels Large drive wheels Small drive axle Small drive axle Do not tie string to axle Do not tie string to axle Axles perpendicular to car Axles perpendicular to car Correct mouse trap relation to car length Correct mouse trap relation to car length

25 Connecting arm to trap

26 Tip: Dont tie string to axle

27 For More Info….

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30 2002

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40 Attaching axle to car

41 gmail.com gmail.com The End gmail.com


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