Grade Level: 7th to 10th; Type: Physics
This experiment demonstrates the conservation and transfer of energy.
- At which angle did the marble roll the fastest?
- With which sandpaper did the marble roll the fastest?
- If you used a heavier marble, would it roll faster or slower and at which angles?
- What is kinetic energy?
- What is potential energy?
- Where does the energy in the marble go?
Energy is always conserved, just changed into different forms. As a rolling marble hits small bumps on sandpaper, its energy is being transferred. But how does this affect the marble? This experiment demonstrates the effects of transferring energy.
- 2 Books
- Very Rough Sandpaper
- Rough Sandpaper
- Smooth Sandpaper
- Small marble
- Place one piece of sandpaper on a flat surface.
- Take one book and place it twelve inches down the sandpaper.
- Take the other book and slant it at a 45 degree angle using your protractor.
- Have a volunteer ready to time how long it takes the marble to roll to the end of the twelve inches of sandpaper.
- Roll the marble down the book and onto the sandpaper. Time and record the data.
- Repeat steps 1-5 using different angles like 20 degrees, 60 degrees, etc.
- Repeat steps1-6 using each of the different sandpaper types.
- Address the research questions.
Terms/Concepts: Slopes, Angles, Speed, Acceleration, Drag, Gravity, Kinetic Energy, Potential Energy
Kinetic and Potential Energy: http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/sarah_schlichting/Energy.html
The Slope of and Angle: http://www.math.washington.edu/~greenber/slope.html