What Is Energy?
P. 30
blue writing indicates that you need to write something on your notes sheet!
Energy
The ability to do work.
(Make things happen)
With your table group:
Choose one of these items and decide if it has/uses energy. What is your evidence?
Potential Energy
Energy that is stored in a system.
Table Talk
Explain to your partner where the energy is stored in this system.
Then, add some notes and details to your drawing
Potential Energy
Energy that is stored in a system.
Potential Energy is stored in the tension of the bow.
The archer’s hand holds the arrow back and keeps the energy stored there
What are some other examples of something that has potential energy?
Choose one of these images and explain why it is an example of potential energy
Where is the energy STORED?
Kinetic
Energy
Energy of motion.
Table Talk
Explain to your partner what would happen to transfer energy to kinetic.
Then, add the arrow to your diagram to show the Kinetic energy.
Kinetic Energy
Energy of Motion
Once the archer releases the arrow, the bow exerts force on the arrow.
This causes the arrow to MOVE which is Kinetic Energy
What are some other examples of something that has kinetic energy?
Choose one of these images and explain why it is an example of kinetic energy
Where is the energy of MOTION?
Forms of
Energy
Table Talk: See if you can determine what form of energy is represented by each of these pictures.
Can you think of any others?
Thermal (KE)
Electrical (KE)
Chemical (PE)
Gravitational (PE)
Elastic (mechanical) (PE)
Light & Thermal (KE)
Sort these types of energy on your notes sheet. If you thought of any others during discussion, add them to the correct box also
Thermal (KE)
Electrical (KE)
Chemical (PE)
Gravitational (PE)
Elastic (mechanical) (PE)
Light & Thermal (KE)
Which ball has more potential energy?
How do you know?
The blue ball is higher up, so it has more potential energy.
Who has more kinetic energy?
How do you know?
Tanya - 3 miles per hour
Tamara - 6 miles per hour
Tamara has more kinetic energy because she is running faster (higher velocity)
1- Which of these balls has more kinetic energy?
2- Which has more potential energy?
3- Which has more energy in total?
The balls are at exactly the same height.
Which has more potential energy?
10 N
100 N
spring 2
spring 1
Spring 2 is more compressed, �so it has more potential energy.
100% potential
75% potential,
25% kinetic
75% kinetic, 25% potential
100% kinetic
How is the energy transferred?
A
B
C
D
How is the energy transferred?
Wrap-Up (write this under your “What is Energy” Notes sheet on P30)
Gravitational Potential Energy (PE)
Depends on mass (m) and height (h) of the object
↑ m = ↑ PE and ↓m = ↓ PE
↑ h = ↑ PE and ↓ h = ↓ PE
Kinetic Energy (KE)
Depends on velocity (speed) and mass of the object
↑ m = ↑ KE and ↓m = ↓ KE
↑ v = ↑ KE and ↓ v = ↓ KE