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Sample Design Record

{short description of image}

Materials Needed:

4 pop tops 4 index cards 2 skewers
2 straws 2 straws tape
hot glue

Design Process:

Design Decision

Rationale

4 Wheels

More Stable

8” x 2.5”

Longer body should go straighter

Weight holder above rear axle

Ease transition between ramp and floor by allowing front to pivot on back axle

Encase holder in wedge shape

Better aerodynamics, use back for motion detector

¼” rail assembly

More rigid, durable construction

Overlap center joint by 1”

Stronger joint

Design / Performance Evaluation:

Design Problem

Resolution

Loss of masses on transition from ramp to floor

Add support under mass holder

Bending of frame during transition from ramp to floor

Add rail along length of car, additional rail across middle for more support

Car turns to right

Adjust wheel/axle to make car go straight

Performance Data (fabricated):

Trial # Variables Graph Slope/
Velocity
Conclusion
1 Mass:10g
Angle:45
{short description of image} .5 m/s Test larger angle
2 Mass:10g
Angle:60
{short description of image} .2 m/s Test smaller angle
3 Mass:10g
Angle:55
{short description of image} .3 m/s Test smaller angle
4 Mass:10g
Angle:35
{short description of image} .6 m/s Test slightly larger angle
5 Mass:10g
Angle:40
{short description of image} .8 m/s Test slightly smaller angle
6 Mass:10g
Angle:37
{short description of image} 1.0 m/s Optimum angle =37 Test mass
7 Mass:20g
Angle:37
{short description of image} 1.5 m/s Test larger mass
8 Mass:30g
Angle:37
{short description of image} 1.7 m/s Test slightly smaller mass
9 Mass:25g
Angle:37
{short description of image} 1.9 m/s Test slightly smaller mass
10 Mass:22g
Angle:37
{short description of image} 2 m/s Optimum mass = 22g

Conclusion:

Using 22g and an angle of 37 degrees, the car should reach an average velocity of 2 m\s during its run.

In addtion to the above, students should also have:

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