Chelsea High School GK-12 Program
 
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LESSON 2: Adding Power to the Car

Subject Area

General Physics (Energy)

Grade

10-12

Estimated Length

5 days

Prerequisite knowledge/skills

  1. The ability to make design modifications to the car
  2. Kinetic and Potential energy

Description of new content

This second lesson of the design project includes adding a gear system to the car. Additionally, the car will be powered using rubber bands.
Goals
  • The first step in this part of the project entails the students adding a gear system to the car.
  • The second step is adding a rubber band power system to the car that will propel the car as far as possible on the floor.

Materials Needed

 

 

 

 

 

The following is a list of K'nex parts that will be needed to complete this project for 15 groups of students:

Item Description Quantity Unit Price $
Red Gear - 2 1/4 inch
60 0.63
Gray Gear - 1 inch 60 0.07
Connectors Grab Bag 5 12
Gray Pully/Tire Insert - 2 inch 120 0.3
Black Tire - 2 1/2 inch 120 0.63
Black Tire - 3 1/2 inch 120 1.2
Gears and Rods Grab Bag 10 5.21

Procedure

 

 

 

 

 

 

 

 

 

 

 

 

 

Day 1-4
The student will have the first four days to design and re-design the gear and power system for the car. This amount of time is given to allow the students the time to test how far and how fast their car is able to travel. The overall goal of this design is to have a car that will travel the furthest on the ground.

The first step in this part of the project entails the students adding a gear system to the car.

  • With the provided gears and axels, the students should add gears to the car that will allow them to drive the wheels using a rubber band power system.
  • This design will include multiple sized gears and multiple gear ratios.
  • The students should be able to figure out what gear ratio is best for their car to go the furthest in a test.

The second step is adding a rubber band power system to the car that will propel the car as far as possible on the floor.

  • The students should be given a choice of 6 different types of rubber bands. These rubber bands should cover a wide variety of lengths and thicknesses.
  • Using the possible rubber bands, the students should make a scientific decision on the best rubber band to use for their car.
  • Also, the student can use multiple rubber bands or connect the rubber bands if desired.

Day 5

On the last day of the lesson, there will be a tournament to find out which group designed a car that can go the furthest.


Evaluation Use this worksheet to evaluate the students understanding of energy and design of the power system.
Extensions  
References K'nex Website