Energy.

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Kinetic and Potential Energy

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Presentation transcript:

Energy

A Few Types of Energy 1. Mechanical 2. Chemical 3. Thermal (Heat) 4. Solar 5. Electrical 6. Nuclear 7. Sound 8. Light

Energy is the ability to do work There are many forms of ENERGY But they all fit into 2 Main Categories Kinetic Potential

Kinetic Energy KE = ½ * mass * speed² Kinetic energy is the energy an object has because of its motion

KE =mv² 2 Kinetic Energy Also written as: KE = kinetic energy ( J ) M = mass ( kg ) V2 = velocity squared (m/s) 2

KE cont. KE & Mass are directly proportional If the MASS is DOUBLED, The KE is DOUBLED. KE & V2 are exponentially proportional If V2 - Doubles, KE Quadruples. ( 22 = 4 ) If V2 -Triples , KE = ( 32 = 9 ) If V2- Quadruples , KE = ?

Gravitational P E GPE = m * g * h GPE = Fg * h GPE = gravitational potential energy, J m = mass, kg g = accleration due to gravity, m/s2 h = height above reference level, m GPE = m * g * h GPE = Fg * h Gravitational potential energy depends on the weight of the body (mass and g) and its separation from Earth

GPE cont. GPE = m * g * h GPE = Fg * h GPE = gravitational potential energy, J m = mass, kg g = acceleration due to gravity, m/s2 h = height above reference level, m GPE = m * g * h GPE = Fg * h What formula is (m x g) referencing? __________ Remember : Fg = ____ Therefore GPE is _____x _____

Mechanical Energy (ME) Energy which is possessed by an object due to its motion OR its stored energy ME= KE + PE and ME = KE + GPE + EPE