Potential Energy Lesson

Potential Energy Lesson

Hotspot

What is your favorite flavor of Smartie?

-> Stored Energy or Energy of Position

Measured in Joules

Potential Energy

-> Energy of Movement
3 Types: Mechanical, Sound, Electrical
Measured in Joules
KE = 1/2 mv²

​​Kinetic Energy

Draw

Circle the examples of kinetic energy in red and the examples of potential energy in blue.

Categorize

Options (8)

compressed spring

car driving

stretched rubber band

swinging wrecking ball

water behind dam

flowing river

skateboarding down hill

standing with skateboard at top of hill

Match the example to either PE or KE.

Potential Energy

Kinetic Energy

Dropdown

A 5 kg bowling ball is rolling down the alley moving at 15 m/s. To calculate the Kinetic Energy is 1/2 mv² .

In this example the m(mass) is the ​

Select answer

and the v(velocity) is the ​

Select answer

.

A 5 kg bowling ball is rolling down the alley moving at 15 m/s. What is the kinetic energy of the ball?

Multiple Choice

What is the kinetic energy of a 2 kg peregrine falcon diving at 80 m/s?

KE = 1/2 mv²

• 10 J

• 160 J

• 320 J

• 6400 J

​Notebook
Page

​Energy gained from position
- bow and arrow being drawn
- books on a bookshelf
- Bowls on a shelf
All have the ability to fall off

​​Energy of Position

​Energy stored in molecules
Rearrange the atoms and you release energy
Common chemical energy
- food - batteries
-fuel - Wood in Fire

​​Chemical Energy

​a device that converts chemical energy into electrical energy

Uses of batteries:
- phones - laptops
- vehicles

​​Batteries

​Three Types of Potential Energy

Match

Match the scenario to the type of Potential Energy it is describing.

• Energy of Position

• Chemical Energy

• Battery

child at top of slide

an apple

plugging in cell phone

• child at top of slide

• an apple

• plugging in cell phone

PE - mgh

m = Mass - kg

g = gravity - 9.8 m/s²

h = height above ground - m

Potential Energy = Joules

​Potential Energy Calculation

​A peregrine falcon has a mass of about 0.9 kg. What is the potential energy of the falcon soaring 200 m above the Earth?

​PE = mgh

PE = ( ) ( ) ( )


PE = J

Multiple Choice

What is the potential energy of a 90 kg skydiver in a plane 500 m above Earth's surface?

PE = mgh

• 4,050,000 J

• 220,500,000 J

• 441,000 J

• 4,410,000 J

Multiple Choice

What is the potential energy of a 0.5 kg book sitting on top of a 1.5 m shelf?

PE = mgh

• 0.6 J

• 7.35 J

• 29.4 J

• 48.0 J

Multiple Choice

What is the potential energy of a 3 kg cat sitting on top of a 2 m wall?

PE = mgh

• 6 J

• 14.7 J

• 58.8 J

• 288.1 J

Draw

Find the KE and the PE of the cat.

A 2 kg cat was sitting on top of a 5 m bookshelf. The cat jumped from the bookshelf and fell at 10 m/s.

What was the PE?

What was the KE?

Draw

Find the Ke and PE of serving a volleyball.

As you hold the volleyball with a mass of 2.1 kg before serving, the ball is 4 m above ground. You serve the volleyball, and it leaves your hand with a speed of 30 m/s.

How much PE did it have?

How much KE did it have?

​REMEMBER!!!

Monday is a GRADED ASSIGNMENT!!

Bring a Calculator & your Science Notebook