The results on the track with nothing were .66 seconds, .55 seconds and .68 seconds. The track with ice went a little faster. Those times were .60 seconds, .60 seconds, and .55 seconds. The track with cooking oil went really fast. The wheels didn't really even move. The car just slid down the track. The times for the oil were .45 seconds, .31 seconds and .41 seconds. The track with pebbles went really slow. Those times were 1.00 seconds, 1.20 seconds, and .78 seconds. The track with sand went very slowly, too. It went a little faster when the car plowed down the sand to the end. Anyway, the times were were .73, .85, and .78 seconds.

The shortest lines on the graph show which tracks the car went the fastest on, and the longest lines on the graph show which tracks the car went the slowest on. The track with sand and the track with pebbles almost went the same speed and were the slowest. The fastest track was the one with oil.

Conclusion: Oil reduces the friction. It was like the wheels didn't even move on the car going down the oil track. The car just slid down the track. The tracks with ice and nothing didn't have too much friction. The wheels moved but didn't move that much. Those tracks were almost like the track with oil, but not as fast. The track with sand caused a little problem. The sand got stuck in the wheels so it almost came to a dead stop. The same thing happened to the track with pebbles. The friction was caused not by the wheels touching the track, but between the substance and the car because the substance was on the track. The car didn't really touch the track at all except on the track with nothing.