By: Ericka Parry

Question: On which surface will the ball roll the farthest? Cupboard Liner CarpetCarpet Pad

Hypothesis: My hypothesis is that the ball will roll farthest on the carpet pad.

Materials: Marble Bicycle ramp Carpet pad Cupboard liner Carpet Measuring tape

Safety: 1. Don’t start experiment without permission and supervision. I didn’t start the experiment until my mom said I could. 2. Clean up after the lab. I put the surfaces back in the basement and put the ramp back in the garage.

Procedure: 1. Place carpet at the bottom of the ramp. 2. Set marble in the middle of the ramp and let it roll down. 3. Measure the distance the ball rolled from the bottom of the ramp. 4. Repeat four times. 5. Repeat steps 1-4 with the cupboard liner and the carpet pad.

Variables: Independent: The surfaces Controlled: The ball that I use, the angle of the ramp.

Data: Distance of Marble Trial Cupboard liner (in) Carpet (in) Carpet pad (in) Average

Conclusion: In conclusion my hypothesis stated that the ball will roll the farthest on the carpet pad. My hypothesis was correct. According to the data the ball rolled the farthest on the carpet pad at 71 inches. Possible problems that might have occurred with this lab include; I might not have put the marble in the exact same spot every time. A solution to this is to mark the spot with a piece of tape. Another problem is the ball almost rolled off, a solution is to put up guard rails.