5 1 nature of energy
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5.1 – Nature of Energy. Write the yellow. Objectives. Distinguish between kinetic and potential energy. Calculate kinetic energy. Describe different forms of potential energy. Calculate gravitational potential energy. Describe how energy can be transformed from one form to another.

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5.1 – Nature of Energy

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5 1 nature of energy

5.1 – Nature of Energy

Write the yellow


Objectives

Objectives

  • Distinguish between kinetic and potential energy.

  • Calculate kinetic energy.

  • Describe different forms of potential energy.

  • Calculate gravitational potential energy.

  • Describe how energy can be transformed from one form to another.


What is energy

What is energy?

  • Energy is the ability to do work

    • or the ability to cause change

  • Anything that causes change must have energy


Forms of energy

Forms of Energy

  • Energy has several different forms—electrical, chemical, radiant, and thermal

    • Energy from the Sun that warms you and energy from the food that you eat are only different forms of the same thing.


Radiant

Radiant

  • Radiant energy from the Sun travels a vast distance through space to Earth, warming the planet and providing energy that enables green plants to grow.


Kinetic energy

Kinetic Energy

  • Kinetic energy is the energy a moving object has because of its motion

    • The kinetic energy of a moving object depends on the object’s mass and its speed


Kinetic energy1

Kinetic Energy

  • The SI unit of energy is the joule, abbreviated J.


Potential energy

Potential Energy

  • Even motionless objects can have energy. This energy is stored in the object.

  • Stored energy due to position is called potential energy.


Example of potential energy

Example of Potential Energy

  • If the apple stays in the tree, it will keep the stored energy due to its height above the ground.

  • If it falls, that stored energy of position is converted to energy of motion.


Elastic potential energy

If you stretch a rubber band and let it go, it sails across the room.

As it flies through the air, it has kinetic energy due to its motion.

The stretched rubber band had energy stored as elastic potential energy.

Elastic potential energy is energy stored by something that can stretch or compress, such as a rubber band or spring.

Elastic Potential Energy


Chemical potential energy

Energy stored in chemical bonds is chemical potential energy

Gasoline stores energy in the same way as food stores energy—in the chemical bonds between atoms.

Chemical Potential Energy


Chemical potential energy1

Chemical Potential Energy

  • Energy is stored in the bonds that hold the carbon and hydrogen atoms together and is released when the gas is burned

  • In this chemical reaction, chemical potential energy is released.


Gravitational potential energy

Gravitational Potential Energy

  • GPE is energy stored by objects due to their position above Earth’s surface.

  • Anything that can fall has stored energy called gravitational potential energy.


5 1 nature of energy

  • GPE = m x g x h

    • g = acceleration of gravity = 9.8 m/s2

    • Like all forms of energy, GPE is measured in joules.


Changing gpe

Changing GPE

  • According to the equation for gravitational potential energy, the GPE of an object can be increased by increasing its height above the ground.

  • If two objects are at the same height, then the object with the larger mass has more gravitational potential energy.


In class assignment homework

In-Class Assignment/Homework

Friday’s assignment:

  • Chapter Review Questions, pg. 133 1-4


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