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Transcript
Potential and Kinetic Energy Notes Energy and Work 1. Energy is the ability to do work. 2. Work occurs when a force causes an object to move in the direction of the force. 3. When one object does work on another, energy is transferred. – Mr. Brown pushing a desk across the floor. Kinetic vs. Potential 4. Kinetic energy is the energy the object has due to its motion. – A ball rolling down a hill. 5. Potential energy is the energy an object has due to its position, shape, or condition. – A girl on a 10ft diving board, a rubber band, two chemicals that react. Kinetic vs. Potential 6. Kinetic energy is found using mass(m) and velocity(v): Kinetic vs. Potential 8. Potential energy is found using height(h) and weight(w): Energy Conversions 10. Energy Conversion – a change from one form of energy to another. 11.Machines help convert energy into a more useful form. Energy Conversion Examples • Kinetic to potential – skateboarding to the top of the ramp and doing a stall • Potential to kinetic – standing on a diving board then jumping off • Light energy to chemical – photosynthesis in plants • Chemical to kinetic – eating breakfast and using that energy to walk, run, kick, etc. More examples • Potential to kinetic – stretching a rubber band and letting go • Electrical to thermal – electricity powering a blow-dryer • Electrical to light – turning on a light bulb • Chemical to sound – an iPod running off battery power.
