# Energy & Types of Energy - PowerPoint PPT Presentation

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Energy & Types of Energy. What is Energy?. The ability to do work Each time work is done, energy is transferred from one object to another Work & energy are so closely related that they are both expressed in Joules (J). What is Kinetic Energy?. Kinetic Energy = ENERGY OF MOTION

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Energy & Types of Energy

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### What is Energy?

• The ability to do work

• Each time work is done, energy is transferred from one object to another

• Work & energy are so closely related that they are both expressed in Joules (J)

### What is Kinetic Energy?

• Kinetic Energy = ENERGY OF MOTION

• All moving objects have kinetic energy

• Objects with kinetic energy can do work

### Example of Kinetic Energy

• Example: A hammer moves & hits a nail The downward swinging force pushes the nail down = work being done

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### How Do You Calculate Kinetic Energy?

• KE = mv2

m=mass

v=velocity

**Velocity has a HUGE affect on kinetic energy

### What is Potential Energy?

• Potential Energy = STORED ENERGY

• This is the energy an object has because of position or shape.

### Example of Potential Energy

• Example: Work is done on a bow to stretch it out and change its shape

### How Do You Calculate Potential Energy?

• Gravitational potential energy depends on an object’s weight & height above the Earth’s surface.

• PE = weight x height

### What is Mechanical Energy & How Do You Calculate It?

• Total energy of motion & position

• ME = KE + PE