Energy
Energy is the capacity to do work. However, the energy specfic to moving objects is called kinetic energy, measured in joules (J). Since kinetic energy is possesed by moving objects, when an object of mass (m) travels at a constant speed (v), it has kinetic energy (Ek):
The work-energy principle tells us that the net amount of mechanical work done on an object equals the object's change in kinetic energy. Basically, work is a change in energy. This means that we can substitutue values of work in for kinetic energy, and vice versa.
The ability of an object to do work because of forces in its enviroment is called potential energy. It is considered a stored form of energy, and is possesed because of its position in relation to enviromental forces. Gravitational potential energy is the energy posessed by an object due to its position relative to the surface of the Earth. In short, the higher above ground level an object is, the more gravitational potential energy is has. To calculate the gravitational potential energy, we use the equation:
The ability of an object to do work because of forces in its enviroment is called potential energy. It is considered a stored form of energy, and is possesed because of its position in relation to enviromental forces. Gravitational potential energy is the energy posessed by an object due to its position relative to the surface of the Earth. In short, the higher above ground level an object is, the more gravitational potential energy is has. To calculate the gravitational potential energy, we use the equation:
Mechanical energy is the sum of an object's kinetic energy and potential energy.
Practice
Worksheets/Quizzes
1. https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6NDczNTlkZmJlNTVlZDdiMQ (potential energy problems)
2. https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6NjQ0MzkzNGI3ZDk4M2MyNg (kinetic energy problems)
3. http://www.sparknotes.com/testprep/books/sat2/physics/chapter7section6.rhtml (multiple choice- see "explanations" for solutions)
4. http://www.dctech.com/physics/help/problems.php?problem=energy-kinetic (kinetic energy problems)
5. http://www.dctech.com/physics/help/problems.php?problem=energy-gravitational (gravitational energy problems)
6. https://docs.google.com/viewer?a=v&pid=sites&srcid=cGF1c2Qub3JnfGJsb29tZml6enxneDo0NmQxYzk3YTM3NTY1Njdi (worksheet)
https://docs.google.com/viewer?a=v&pid=sites&srcid=cGF1c2Qub3JnfGJsb29tZml6enxneDo0NGFjMzA2ZGM4NjU1Mzhj (SOLUTIONS)
7. https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6ZjcxMmE3MjNkMjdlYzY5
8. http://www.physics247.com/physics-homework-help/energy_quiz1.php (fill in blanks)
Videos/ Simulations
1. http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/forces/kineticact.shtml (further understanding of gravitaional and kinetic energy- video)
2. http://phet.colorado.edu/en/simulation/energy-skate-park (energy simulation)
3. http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=405&ClassID=2057186 (energy simulation)
1. https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6NDczNTlkZmJlNTVlZDdiMQ (potential energy problems)
2. https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6NjQ0MzkzNGI3ZDk4M2MyNg (kinetic energy problems)
3. http://www.sparknotes.com/testprep/books/sat2/physics/chapter7section6.rhtml (multiple choice- see "explanations" for solutions)
4. http://www.dctech.com/physics/help/problems.php?problem=energy-kinetic (kinetic energy problems)
5. http://www.dctech.com/physics/help/problems.php?problem=energy-gravitational (gravitational energy problems)
6. https://docs.google.com/viewer?a=v&pid=sites&srcid=cGF1c2Qub3JnfGJsb29tZml6enxneDo0NmQxYzk3YTM3NTY1Njdi (worksheet)
https://docs.google.com/viewer?a=v&pid=sites&srcid=cGF1c2Qub3JnfGJsb29tZml6enxneDo0NGFjMzA2ZGM4NjU1Mzhj (SOLUTIONS)
7. https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6ZjcxMmE3MjNkMjdlYzY5
8. http://www.physics247.com/physics-homework-help/energy_quiz1.php (fill in blanks)
Videos/ Simulations
1. http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/forces/kineticact.shtml (further understanding of gravitaional and kinetic energy- video)
2. http://phet.colorado.edu/en/simulation/energy-skate-park (energy simulation)
3. http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=405&ClassID=2057186 (energy simulation)
