Presentation is loading. Please wait.

Presentation is loading. Please wait.

MESA Mouse Trap Powered Cars

Similar presentations

Presentation on theme: "MESA Mouse Trap Powered Cars"— Presentation transcript:

1 MESA Mouse Trap Powered Cars


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 Drag Acceleration Torque Momentum

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
Too much torque = less distance (wheel spin) Too little torque = car will not move Torque altered by changing power arm angle to axle Firm string to axle attachment

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

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

17 Long Car

18 Short Car

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

20 Long Arm 2009

21 Large Wheel Diameter

22 Large Diameter wheels Small Diameter Axles

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

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

25 Connecting arm to trap

26 Tip: Don’t tie string to axle

27 For More Info….



30 2002










40 Attaching axle to car

41 The End

Download ppt "MESA Mouse Trap Powered Cars"

Similar presentations

Ads by Google