Plastic Lever

36 copperpennies

Large 2 ¾ diameter wooden wheels

It gives it the force to move

Weighs down lever

Gives the cruiser maximum distance

Our Goals

To travel at least 3 metersTo have our gravity cruiser

travel 1 foot in 1 second or lessTo have our cruiser be as

attractive as its distance traveled

Goal: To travel at least 3 meters

Goal: To have our gravity cruiser travel 1 foot in 1 second or less

Goal: To have our gravity cruiser be as attractive as distance traveled

• We Created are chassis (the bottom of the cruiser)

• First we used the large wheels and we got these test scores...

• Large Wheel: 2 3/4 inches• 1) 430 cm ( curved )• 2) 490 cm ( straight ) • 3) 500 cm ( pretty straight ) wobbly wheel• 4) 20 cm ( failure ) fixed the wobbly wheel• 5) 40 cm ( curved after 40 ) undid fixed

wheel

• We completely took apart the model and replaced the small wheels with large ones.

• We adjusted the wheels.• Adjusted the axels.• We tested to see which side worked

better as the front.• Today we found which side was the

front, and decided how to get the straightest results.

• Second we used the big wheels and got these scores

• Large Wheel: 2 3/4 inches• 1) 100 m (curved after 100)• 2) 100 m (curved after 100)• 3) 50 m (straight)• 4) 100 m (curved after 100)• 5) 100 m (curved after 100) • 6) 200 m(curved after 200)• 7) 340 m (curved after 340)• 8) 550 m (curved after 550)

• With Top:• 1) 180 cm ( curved 100 ) • 2) 100 cm ( curved 100 )• 3) 320 cm ( curved after 300 )• 4) 459 cm ( curved after 450 ) • 5) 320 cm ( curved after 320 ) • 6) 420 cm • Added paperclips

On Day 3 we added are lever with pennies and string so now it can move on its own.

Here is some of the data we recorded:1)270cm2)300cm3)210cm4)300cm5)420cm6)450cm

Today we didn’t really test except for when we added on a sail.

But, Bishop did not like the idea of the sail so we had to take it off. Also we worked on improving how the string is wound up and how it is connected.

• With ramp• 1) 760 cm ( straight ) • 2) 630 cm ( slight curve ) • 3) 600 cm ( curved ) • 4) 300 cm ( curved a lot ) • Not with top• 5) 330 cm ( curved ) • 6) 330 cm ( curved a lot )• 7) 570 cm ( curved )

Over the past 5 days we have been building, testing, and improving our Gravity Cruiser. When testing our prototype we often came upon problems such as not following a straight line. We encountered this problem and fixed it by adjusting the wheels, axels and tightening tape and other lose pieces. After correcting these problems our Gravity Cruiser’s overall performance was better and we had a easier time reaching our goals.

Fast 5 cruiser can travel over 3 meters, averaging at 3 feet per second! This model is equipped with 2 ¾ in diameter wheels, a 36 penny weighed lever and a plastic but durable chassis. Be the first to own this gravity sensation for only $19.95!

PLEASE CALL: 1-800-GRAVITY