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Energy

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**A Few Types of Energy 1. Mechanical 2. Chemical 3. Thermal (Heat)**

4. Solar 5. Electrical 6. Nuclear 7. Sound 8. Light

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**Energy is the ability to do work**

There are many forms of ENERGY But they all fit into 2 Main Categories Kinetic Potential

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**Kinetic Energy KE = ½ * mass * speed²**

Kinetic energy is the energy an object has because of its motion

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**KE =mv² 2 Kinetic Energy Also written as:**

KE = kinetic energy ( J ) M = mass ( kg ) V2 = velocity squared (m/s) 2

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**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 = ?

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**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

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**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 _____

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**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

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