I. OBJECTIVE:

In this project, we will build and design an electric car. A motor and two batteries are the main source of the energy that make the car running without any manual help (use hand to give a lift.)

II. EQUIPMENT:

• Gears (16, 42/10, 60)
• 4 Wheels, Chassis, Tires
• 2 AA Batteries, 2 Battery holders
• washers, 3 axels, double sided tape
• Switch, motor

III. PROCEDURE:

• Place each of the axels through the holes.
• Place 3 washers in each of the axels , except for one of the sides.
• Place on gear ( 42/10 ) in the side that does not have any washers.
• Place each of the wheels on the axels.
• Place the toy motor on the side that has on gear.
• Place the smallest gear on the pinoin of the toy motor.
• Place into a hole conduit strap , type 3/4 tw , adjust if needed.
• Using one washer a screw , and a wing nut , placing them in the hole in the conduit strap screw them in to hold the motor in place . ( Place them in the following order : washer , screw , and the nut on the bottom to hold the screw in place.)
• Place 2 pieces of two-sided sticky tape on the end of the car ( other side of the motor ) then place a battery holder on top of the tape.
• Put a double AA inside the battery holder.
• Connect the wires positive (+) to negative (-) and you have a working car!

IV. ANALYSIS:

Our main concern is the gears. Originally, the hole of the gears did not fit to the axels of the car. First, we use soldering tool to expand the hole. However, this method did not work because the hole was not nicely fit to the axels. They made the car could not go straight. Then, we decided to use a driller machine. It works very well. Now, we have to calculate the gear ratio so that the car will be able to carry twelve ounces of weight. We finally used 16, 42/10, and 60 size gear. We believe they fit to each other.

V. CONCLUSION:

Finally, we have finished building an electric car. Each of us have learned that by connecting the gear ratio correctly, the car will satisfy the requirement of the judge. At last, we overcome the problem of the gear. Our car now able to carry twelve ounces of weight and climb up hill of about twenty degree and three meter long.