April 7, 2009 Study for 5 min for your quiz.

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Presentation transcript:

April 7, 2009 Study for 5 min for your quiz. You need: Calculator and Writing Utensil When you are done with quiz: Bring it up and pick up a note sheet for Energy!

Goals To explain different types of energy To calculate potential and kinetic energy

Q: What is ENERGY? Energy is…. the ability to do work a measure of how much work is done a word to describe the power and effort of a force. measured in Joules

ENERGY Energy is the ability to do work Doing work uses energy An object can gain energy if work is done on it

Q: What is ENERGY? Two MAIN types of mechanical energy: Potential energy Kinetic Energy

Q: What is POTENTIAL ENERGY? Potential Energy (PE) is stored energy Coaster has PE when it is at the top of the hill. Even if it isn’t moving yet, it may if a force is applied and it begins to move

Q: What is POTENTIAL ENERGY? Gravitational potential energy (GPE) is the energy of an object due to its position above the surface GPE = mgh = wh m=mass (in Kg) g=acceleration due to gravity … 9.8 m/s2 h= height (in m) w = weight (N) UNITS:

“Homework” Complete the Practice Problem for PE on your note sheet!

Equation: GPE = m x g x h h = 35 m m = 65 kg g = 9.8 m/s2 GPE = ? PRACTICE PROBLEM: Find the PE of a rock climber as she climbs 35 m above the base of a cliff. Her mass is 65 kg. Equation: GPE = m x g x h Given: h = 35 m m = 65 kg g = 9.8 m/s2 GPE = ? Solve: GPE = 65 kg x 9.8 m/s2 x 35m =22,295 J

Q: What is KINETIC ENERGY? Kinetic Energy (KE) is the energy due to an object’s motion Active energy A rock as it falls off of a cliff Formula: KE = ½ * m * v2 m= mass (kg) v = velocity (m/s) UNITS:

PRACTICE PROBLEM: What is the KE of a 44 kg Cheetah running at 31 m/s? Given: m = 44 kg v = 31 m/s KE = ? Equation: KE = ½ * m * v2 Solve: KE = (1/2) (44 kg) (31 m/s)2 21,142 J

Homework Kinetic and Potential Energy WS