Part A: Introduction
a. Theoretical Background
The rubber band car is a car powered by a single rubber band. Energy efficiency is the amount of energy that is first stored in an object. The physic's definition of energy efficiency is very similar. Their term is the linear distance traveled using the energy stored in one rubber band. Energy efficiency is usually found when an object's energy transfers into a different type of energy. For us to find this, we have to attach a rubber band onto the car and release the rubber band to make the car move forward. The physic's definition is very reasonable because the rubber is the main and only source of energy that is applied to the car. b. Purpose
The purpose of this experiment is to see how energy efficiency a rubber band car really is. We have to record the time/distance the rubber band car travels to find its energy efficiency rate.
Part B: Hypothesis
We expect to find the rubber band car to move in a linear direction after the rubber band is released. This is expected because the rubber band is connected to the back axle of the car. The wheels should then be rotating which will cause the car to move forward.
Part C: Design of Experiment
In this lab, we are building and testing a rubber band powered vehicle to work towards energy efficiency. After designing a base structure for the rubber band powered vehicle, we will build it and test it on the floor in school hallway. We will test the distance it traveled in the amount of time that it took for it to get there. Also the capabilities of re-use after many uses of the vehicle. Dependent Variable:
In this lab the dependent variable is the rubber band powered vehicle because it needs the rubber band to make it move. Also the rubber band needs human interaction in order to wind the rubber band up on the vehicle to make it move. Independent Variable:
Well the independent would probably be one of my group members or me. For if it was not one of us then the car would never move and would be in one state of static equilibrium with the floor in no motion. Control:
The control would be the teacher's rubber band powered car because we would compare our results as a group with the results of the teacher.
Part D: Materials and Procedures
3in by 18in Synthetic Polymer Board
Wheels with rubber lining and axles from the provided kit
Craft Super Glue
B. Specific Procedures
1. Design the rubber band powered vehicle.
2. Build the rubber band power vehicle.
3. First you take the 3in by 18in Synthetic Polymer Board and cut 3in off of the 18in long side of it. 4. Next you take the balsa wood and make a frame 3in by 18in and super glue it together. 5. Now make holes on one side of that frame to put in the rear wheels axle and cut it about and inch from the end. 6. After that glue the frame to the Synthetic Polymer Board. 7. Now cut a straw to the size of the length of the front axle and glue it to the front of the balsa wood frame. 8. Now Put the provided wheels and axles on the rubber band powered vehicle.
9. After that step is completed, get a piece of balsa wood about a ¼ an inch ans make a sharp point on it. 10. Cut a hole in the center of the synthetic polymer board about 3in from the short side and 1.5 in from the long side. 11. Stick the sharpened piece of balsa wood into the hole. 12. Then attach the rubber band to that piece of the balsa wood. 13. The car is ready to be tested after letting the glue settle for at least 10 minutes. 14. The rubber band car is ready to be tested.
15. Line up the meter sticks in the hallway.
16. Ready the stop watch.
17. Wind up your rubber band powered vehicle....