Question

insert the axles. slide a short stick through the holes on each end of the bottle.
add the wheels. slide a cap onto each short stick. use the clay dough to hold it in place.
make it go! place your car on a ramp and watch it go. experiment with ways to make it go faster or slower.
2 write two changes that would make your bottle car go faster or slower. then write what you think will happen. see the example below.
change: take off the wheels.
possible result: this will make more friction and make the car go slower.
change:
possible result:

change:
possible result:

Explanation:

1. For the first change, reducing friction on wheels allows them to spin more easily, increasing speed.
2. For the second change, adding extra weight increases downward force, which boosts friction and slows the car.

Answer:

Change: Lubricate the wheel axles.
Possible result: This will reduce friction between the axles and wheels, making the car go faster.

Change: Add heavy weights to the bottle car.
Possible result: This will increase the car's mass, creating more rolling friction and making the car go slower.