Pictures and Videos: 10-15 minutes using my smart phone Final Project Sample Pictures and Videos: 10-15 minutes using my smart phone Slides:15-20 minutes

Problem: How will the mass of the car affect it’s speed?

Independent variable (what I change): mass of car

Control Variables (what stays the same): distance, force, track, car

Dependent variable (what changes as a result): time/speed

Possibilities: The time will increase, meaning the speed has decreased (deceleration) The time will decrease, meaning the speed has increased (acceleration) The time remains the same, meaning the speed remains the same

Hypothesis: If the mass of the car increases, then the speed will decrease.

Procedure:

Data: 1 marble (least mass) 2 marbles (more mass) 3 marbles (most mass) 0.1738 s 0.1858 s 0.2444 s 0.2002 s 0.1941 s 0.2105 s 0.1889 s 0.1922 s 0.2218 s Average: 0.1876 s 0.1907 s 0.2256 s

Conclusion: As mass increased, the speed of the car decreased (it decelerated).

Sources: CPO Focus on Physical Science Mrs. Bertoson’s Power Point “Forces CPO 2nd Law” http://www.physicsclassroom.com/class/newtlaws/u2l3a.cfm