Electric car Pitch:

The design

 

The Circuit

 

for the batteries we gotta connect to the motor, in the motor we will put the switch on the middle. also we will search up how to make a DIY switch in google.

After make the switch, put them together and connect to circuit.

Materials: batteries, motor, wheels, the body of the car( 3D printer), gears, sticks, cardboards.

Switch:

First we use the cardboards to cut out nine pieces rectangle, and use the hot glue gun to connect each other. The switch will connect the red wires so the electric current can flow through.

The wheels we will be borrowed from the library.

For the sticks we will be connect to the wheels to sticks that will be help for support the body for car.

The body for car will be used 3D printer:

for the body of the car length will be 19.2 cm.

the width will be 9.2cm.

the middle bottom of the car we will put the motor. the left bottom of the car will put the batteries on it.

 

the side of the car we will use bamboo skewer to go through those holes and connect the wheels.

 

The gears

we will use two gears to try to make the car run faster.

AFTER all the steps we made, we put it together and the DC motor car will be made.

Part Two: Individual Write-Up

Final Product:

In designing our electric car we used the principles of:

• • • Friction:
      • We noticed that to make sure that the car takes off, we had to add friction to the back wheels to ensure that it moves.
      • And we added it to the back wheels, because they are connected to the axel of our car.
    • Converting chemical energy into mechanical energy:
      • To create mechanical energy we used the battery electricity (chemical energy) and converted it using the gears — which is attached to the motor.
    • Electricity:
      • We used a series circuit — with wires — to form a loop to create a path for the electricity to travel through, but in the process of making the loop we made a make-shift switch to control when the batter turns on and off

Certain principles we used to solve problems in our car:

• • When the car had a hard time moving:
    • We also took off the rubber on the front wheels to make them lighter. Because, we noted the lighter it was the faster it accelerated — which in turn made it move faster.
    • We tested this method by: timing the car when it traveled from a certain distance and saw that the lighter it was the faster it took off.
  • The axel was not spinning smoothly:
    • We wanted the axel to have minimal friction since it would be more difficult for the car to take off it had resistance on the axel.
    • So, we used straws and used them as to hold the axel in place while ensuring that the surface won’t restrict its motion.

How could our design be improved ?

• • Using the principle — which kinetic energy is proportional to the square of velocity. Our design could have used even lighter materials to create a faster acceleration. Like, how one of the groups used CD’s for wheels making it lighter, thus faster for the car to move.
  • We could have made the mechanical energy more fluid without any inconsistencies, with gears that aligned perfectly. Gears are supposed to be at a 3:1 or a 4:1 ration. We have should chosen better numbers like, 20 & 15 to create our gears. Instead 26 which could still work but is a bit hard to work with.