FOUNDATIONS OF PHYSICSNotebook Assignment #10

Energy Notes

Energy

Potential Energy

Gravitational Potential

Energy

Elastic Potential Energy

Kinetic Energy

Dissipated Energy

Classified As

Divided Into

ENERGY

The ability to cause change Can be transferred from one place or object

to another Can be converted from potential to kinetic or

kinetic to potential Energy can not be created or destroyed. This

is called the Law of Conservation of Energy.

POTENTIAL ENERGY

Stored Energy Has the potential to cause something to

change, but is not currently causing a change

Several different representations of potential energy. The two main categories: Gravitation and Elastic Potential Energy

GRAVITATIONAL POTENTIAL ENERGY (GPE)

Results from an object being raised up while the force of gravity acts on it.

Depends on the force of gravity and how high the object is raised.

ELASTIC POTENTIAL ENERGY (EPE)

Results from an elastic material being stretched or compressed some distance.

Depends on how far the elastic material is stretched / compressed and the material’s spring constant.

KINETIC ENERGY

Energy of motion Depends on the speed of the object and its

mass

DISSIPATED ENERGY

Energy that is converted into energy that can no longer be “used” as kinetic or potential energy.

Dissipated energy usually remain in the original location or object.

ENERGY PIE CHARTS

Used to illustrate conservation of energy and energy conversion

The size of the pie (circle) indicates the total energy of the object(s)

The size of the pie pieces (divisions in circle) illustrates the amount of each energy.

Total Energ

y

Kinetic Energy (KE)

Elastic Potential Energy (EPE)

Gravitational Potential Energy

(GPE)

ENERGY PIE CHARTS - WORKSHEET

1. A wind-up toy is fully wound and at rest.

EPE

All of the energy in the rabbit is stored in the “wound” spring

ENERGY PIE CHARTS - WORKSHEET

2. A wind-up toy is wound up and moving across level ground. The toy is speeding up.

EPE

KEKE

KEEPE

EPE

Elastic Potential Energy is converted to Kinetic Energy

ENERGY PIE CHARTS - WORKSHEET

3. The toy is wound up and is moving at a constant speed up an incline.

EPE

EPE

EPE

KE

KE

KE

GPE

GPE

Elastic Potential Energy is converted to Gravitational Potential Energy while Kinetic Energy remains constant

ENERGY PIE CHARTS - WORKSHEET

4. The toy is wound up and moving along at a constant speed.

EPE

EPE EPEKEKE

KE

DissDiss

Elastic Potential Energy is converted to Dissipated Energy while Kinetic Energy remains constant

ENERGY PIE CHARTS - WORKSHEET

5. The toy is wound up and slowing down as it moves up an incline.

EPE

EPE

EPE

KE

KE

KE

Diss

Diss

Elastic Potential Energy is converted to Dissipated Energy while Kinetic Energy remains constant

ENERGY PIE CHARTS - WORKSHEET

6. The toy is wound up and speeding up as it moves up an incline.

Elastic Potential Energy is converted to Kinetic Energy and Gravitational Potential Energy

EPE

EPE

EPE

KE

KEGPE

KEGPE