Energy Chapter 4.

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Presentation transcript:

Energy Chapter 4

What is Energy? Every change that occurs requires energy Energy is the ability to cause change

Kinetic Energy Kinetic energy is the energy a moving object has because of its motion It depends on the objects mass and speed Kinetic energy (in joules) = ½ mass (in kg) x [speed (in m/s)]2 KE = ½ mv2 Joule is the unit for energy

Solving for Kinetic Energy A jogger with a mass of 60 Kg is moving at a speed of 3.0 m/s. What is the jogger’s kinetic energy? m = 60 kg Speed = v =3.0 m/s KE= ½ mv2 KE= ½ x 60 x 3.02 = 270 Don’t forget your units! Your final answer is 270 J

Potential Energy Potential energy is stored energy Types: Elastic potential energy is stored energy by something that can stretch or compress Ex. Rubber band Chemical potential energy is energy stored in chemical bonds

Potential Energy Gravitational Potential Energy is energy stored by objects due to their position above Earth’s surface. Depends on the mass and height above the ground Gravitational potential energy (J) = mass (kg) x acceleration of gravity (m/s2 ) x height (m) GPE = mgh

Solve for GPE What is the gravitational potential energy of a ceiling fan that has a mass of 7.0 kg and is 4.0 m above the ground? M = 7.0 kg H = 4.0 m Acceleration of gravity is g = 9.8 m/s2 GPE = mgh GPE = 7 x 9.8 x 4 = 274 J DON’T FORGET YOUR UNITS

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