Potential Energy Lesson
Presentation
•
Science
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7th Grade
•
Practice Problem
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Medium
+14
Standards-aligned
Laura O'Neill
Used 4+ times
FREE Resource
14 Slides • 11 Questions
1
Potential Energy Lesson
2
Hotspot
What is your favorite flavor of Smartie?
3
-> 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
4
5
Draw
Circle the examples of kinetic energy in red and the examples of potential energy in blue.
6
Categorize
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.
7
Dropdown
In this example the m(mass) is the
8
A 5 kg bowling ball is rolling down the alley moving at 15 m/s. What is the kinetic energy of the ball?
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10
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
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12
Notebook
Page
13
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
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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
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PE - mgh
m = Mass - kg
g = gravity - 9.8 m/s2
h = height above ground - m
Potential Energy = Joules
Potential Energy Calculation
16
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
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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
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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
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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
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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?
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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?
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REMEMBER!!!
Monday is a GRADED ASSIGNMENT!!
Bring a Calculator & your Science Notebook
Potential Energy Lesson
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