Newton's Second Law of Motion
Acceleration is represented by the number of rubber bands. The more rubber bands, the greater the acceleration. The greater the acceleration, the greater distance the car travels due to the force on the car. Mass is represented by the weight of the pill bottle. The greater the mass, the greater distance the car travels due to the force on the car. If acceleration and mass are both increased, the force on the car is even greater and car will travel even further.
f=ma (f=force, m=mass, a=acceleration)
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