Conservation of Energy

Conservation of Energy

The many forms of Energy

Open Ended

In one minute, name as many forms of energy as you can?

Water

Water has several forms.  It forms ice and water vapor.  In a similar way, energy has different forms, such as energy due to motion or energy due to object interaction.

Water Demonstration

Water can go from Ice - Liquid - Steam, nonetheless, it is still water.

Throwing a ball

How does the energy transfer from a ball at rest to a ball that is thrown?

Catching a Ball

How does the kinetic energy transfer from a ball that is moving to coming to a stop after being caught.

Kinetic Energy

Energy in motion

Potential Energy

Stored Energy

Gravitational Potential Energy

Stored Energy due to Gravity

Calculating Gravitational Potential Energy

GPE = mgh

Open Ended

Example Problem - You lift a 7.30 kg bowling ball from a storage rack and hold it up to your shoulder. The storage rack is 0.61 m above the floor and your shoulder is 1.12 m above the floor.

a. When the bowling ball is at your shoulder, what is the ball-Earth system's gravitational potential energy relative to the floor

Open Ended

Example Problem - You lift a 7.30 kg bowling ball from a storage rack and hold it up to your shoulder. The storage rack is 0.61 m above the floor and your shoulder is 1.12 m above the floor.

b. When the bowling ball is at your shoulder, what is the ball-Earth system's gravitational potential energy relative to the rack?

Open Ended

Example Problem - You lift a 7.30 kg bowling ball from a storage rack and hold it up to your shoulder. The storage rack is 0.61 m above the floor and your shoulder is 1.12 m above the floor.

c. How much work was done by gravity as you lifted the ball from the rack to shoulder level?

Practice Problems

Open Ended

Exit Ticket - What is the formula for Gravitational Potential Energy?