Final answer:
Increasing the force used to send a car down the track causes the car to accelerate and move faster. This represents Newton's second law of motion, which states that force and acceleration are directly proportional.
Step-by-step explanation:
When you increase the force that you are using to send the car down the track, the car will accelerate and move faster. This is because force and acceleration are directly proportional according to Newton's second law of motion: F = ma. The greater the force, the greater the acceleration.
Learn more about Force and acceleration in Newton's second law of motion