Unit 6 Types of Energy 6 1 Nature

Unit 6 Types of Energy 6. 1

Nature of Energy • Energy is all around you! – You can hear energy as sound. – You can see energy as light. – And you can feel it as wind.

Nature of Energy • You use energy when you: – hit a softball. – lift your book bag. – compress a spring.

Nature of Energy Living organisms need energy for growth and movement.

Nature of Energy • Energy is involved when: – – a bird flies. a bomb explodes. rain falls from the sky. electricity flows in a wire.

Nature of Energy • What is energy that it can be involved in so many different activities? – Energy can be defined as the ability to do work or cause change. – If an object or organism does work the object or organism uses energy.

Work

What is Kinetic Energy? K. E. = 1/2(mass x speed 2)

KE = 1/2 m v 2 • • 4 kg bowling ball at 10 m/s =. 5 (4 kg) (10 m/s)2 = 200 J • . 25 kg baseball • at 50 m/s • =. 5 (. 25 kg) (50 m/s)2 • = 312 J

PE = mgh • m = mass (kg) • h = height (m) • g = accel due to gravity – (9. 8 m/s 2)

What is Gravitational Potential Energy? o Potential energy due to an object’s position Don’t look down, Rover! Good boy! o P. E. = mass x height x gravity

What is Potential Energy? o Energy that is stored and waiting to be used later

What is Elastic Potential Energy? o Potential energy due compression or expansion of an elastic object. Notice the ball compressing and expanding

What is Chemical Potential Energy? o Potential energy stored within the chemical bonds of an object