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1. Does the track with nothing go faster than the track with sand? YES/NO
2. Do the wheels on the car move in oil? YES/NO
3. Do the pebbles get pushed down as the car goes down? YES/NO
4. Did the pebbles track move slower than the oil track? YES/NO
5. Did the track with pebbles go faster than the track with sand? YES/NO
6. How long was the track I used?
7. How many substances did I use?
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