ENERGY.

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Presentation transcript:

ENERGY

Every change that occurs involves ENERGY!

What is Energy? The ability to cause change

How is the energy different? Turn on ipod and sound comes through headphones Turn on light and a dark room becomes bright

Forms of Energy Include: Electrical Chemical Radiant

Electrical

Chemical

Radiant Thermal and Light

Energy is Like Money… How?

You have $100 You can store it or transfer it in a variety of different forms, but it is still money

Usually when you think of energy, you think of action – or some sort of motion taking place

Kinetic energy Energy in motion

Kinetic Energy depends on two things: An object’s mass and velocity

The greater the mass or velocity, the greater the kinetic energy

Calculating Kinetic Energy Kinetic Energy = ½ mass X velocity² kg m/s²

Energy is measured in units called Joules (J) Named after James Prescott Joule who discovered in 1842 the amount of work it took to produce a unit of heat. He decided that heat is a form of energy and energy comes in different forms. In his honor, the unit for energy was named joule.

How much is a joule? The amount of energy required to lift an apple one meter Serve of a tennis ball 75 J Fastball pitch 120 J Forward pass 150 J

Kinetic Energy = ½ mass X velocity² Practice How much kinetic energy does an object have if its mass is 2.08 kg and its moving at a constant speed of 5.51 m/s? Kinetic Energy = ½ mass X velocity²

Which has a bigger effect on Kinetic Energy…Mass or Velocity? What is the Kinetic Energy (in Joules) of an object with a mass of 10 kg and a velocity of 10 m/s?

Mass When mass is doubled, Kinetic Energy is doubled

Velocity (speed) When velocity is doubled; Kinetic Energy is quadrupled!!

Kinetic Energy = ½ mass X velocity² A large truck has more kinetic energy than a motorcycle moving at the same speed. But speed is squared, so speed has a greater effect on kinetic energy than mass does.

Car crashes… More dangerous at higher speeds than at lower speeds. A moving car has 4 times the kinetic energy of the same car going half the speed. It is going twice the speed and speed is squared to make 4.

Smart car crash test

Practice KE = ½ mv2 What is the kinetic energy of a car with a mass of 500 kg and a speed of 5 m/s? What is the mass of an object with a speed of 30 m/s and a kinetic energy of 400 J?

Assignment! Worksheet practicing Kinetic Energy