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Kinetic and Potential Energy

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Presentation transcript:

Homework Questions?

Unit 3: Energy and Momentum Energy Objectives: 1. Define work and calculate the work done by a force. 2. Calculate the kinetic energy of a moving object. 3. Determine the gravitational potential energy of a system. 4. Calculate the power of a system. 5. Apply conservation of energy to analyze energy transitions and transformations in a system. 6. Analyze the relationship between work done on or by a system, and the energy gained or lost by that system. 7. Use Hooke's Law to determine the elastic force on an object. Calculate a system's elastic potential energy.

Kinetic and Potential Energy

Kinetic Energy Kinetic energy is energy of motion. KE = Kinetic Energy m = mass v = velocity

Potential Energy Potential Energy (PE) is energy an object has due to its position Gravitational potential energy (PEg) is the energy an object has because of its position in a gravitational filed (height).

So the formula could also be re-written as Note! We know that PEg = mgh But we also know Fg = mg So the formula could also be re-written as PE = Fgh

Energy Transformations - Energy can be transformed from one type to another. - You can transfer energy from one object to another by doing work. Work-Energy Theorem Work done on a system by an external force changes the energy of the system. If they are asking about change in total energy, they are asking about work. [Note: Work is directly transferred to Kinetic Energy.]

Practice (We will go over 52-55 on Thursday)