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Title:

MESA Mouse Trap Powered Cars

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Title: MESA Mouse Trap Powered Cars Author: Russ Hill Last modified by: IMRANA IQBAL Created Date: 9/25/2010 8:42:11 PM Document presentation format – PowerPoint PPT presentation

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Slides: 42
Provided by: russ51
Learn more at: http://www.sausd.k12.ca.us
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Tags: mesa | cars | drill | mouse | powered | string | trap

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Title: MESA Mouse Trap Powered Cars


1
MESAMouse Trap Powered Cars
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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 Dont tie string to axle
27
For More Info.
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2002
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Attaching axle to car
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drrusshill_at_gmail.com The End
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