Energy is the ability to do work or cause change.

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Presentation transcript:

Energy is the ability to do work or cause change. The unit for measuring energy is the Joule (J).

Energy

Types of Potential Energy Chemical potential energy The nutrients in the banana are chemicals which are stored in the food. Gravitational potential energy The skydiver has potential energy due to his height above the ground

Types of Potential Energy Elastic potential energy The arrow has potential energy due to the elastic nature of the bow Energy is stored in the nucleus of an atom. Nuclear potential energy

On Earth the acceleration of gravity is 9.8 m/s2, and has the symbol g.

A roller coaster car of mass 465 kg rolls up a hill with a vertical height of 75 m from the ground. What is the potential energy relative to the ground? GPE = mass x acceleration of gravity x height

A bar weighing 550 g is raised 3. 0 m off the ground A bar weighing 550 g is raised 3.0 m off the ground. What is its potential energy? GPE = mass x acceleration of gravity x height

What is the mass of a girl if she was raised 2 What is the mass of a girl if she was raised 2.00 m off the ground and has a potential energy of 555 J? GPE = mass x acceleration of gravity x height

Practice: KE = ½ mv2 A .10-Kilogram bird is flying at a constant speed of 8.0 m/s. What is the birds KE? A 70.0 Kg man is walking at a speed of 2.0 m/s. What is the KE?

Practice: KE = ½ mv2 A 1400 Kg car is moving at a speed of 25 m/s. How much KE does the car have? *A 50.0 Kg Cheetah has a KE of 18,000 J. How fast is the cheetah running?

KE = ½ mv2 PE = mgh ME = KE + PE A car weighing 5,500 kg, travels at a speed of 55 km/h up a 15 m hill. What is its mechanical energy? KE = ½ mv2 PE = mgh ME = KE + PE