Energy
Partner Talk: What is Energy? Where have you heard the word energy before? What do you think it means? Give examples of energy from everyday life.
Fill in your notes as you read. Read pp. 214-217 Fill in your notes as you read. (We will go over the correct answers, so don’t worry if you can’t fill in everything. Fill in what you can so that you have less to write down later.)
Notes: What is Energy? Energy is the ability to do work or cause matter to change. Examples of energy in everyday life: hitting a baseball holding a book above your head digesting food heating water
Two Types of Energy: Kinetic Energy Potential Energy https://www.youtube.com/watch?v=7K4V0NvUxRg
Kinetic Energy Kinetic Energy is the energy of motion. It depends on the mass and speed of a moving object. Formula: KE = mv2/2
PARTNER TALK Apply the formula KE = mv2/2 to the following scenarios: A smart car and a semi-truck are driving down the road at equal speeds. Which has more kinetic energy and why? Two cars of the same size are driving down the road. One is going 50mph and one is going 75mph. Which one has more kinetic energy and why? A 1000kg car is driving 80m/s. What is its kinetic energy in Joules?
Examples:
Potential Energy Potential Energy is the energy an object has from its position or shape. Potential energy is stored energy in an object.
Examples: COMPRESSIONAL GRAVITATIONAL ELASTIC
Potential Energy An object with potential energy has the ability to move, change, or do work. Formula (gravitational potential energy): PE = weight x height
PARTNER TALK Apply the formula PE = weight x height to the following scenarios: Mrs. Johnson is going to drop an object on your head. Would you rather it be a ping pong ball or a golf ball? Why? Why would it hurt more to drop something on your foot from higher up than from closer to your foot? What is the potential energy in Joules of a 100 N object lifted to a height of 10 meters?
How are Potential Energy and Kinetic Energy related? Energy can be transferred from potential to kinetic energy. If an object has more potential energy at first, then it will have more kinetic energy when it starts moving.
Potential, Kinetic, or Both?
Potential, Kinetic, or Both?
Potential, Kinetic, or Both?
Potential, Kinetic, or Both?
Potential, Kinetic, or Both?
Potential, Kinetic, or Both?
Card Sort For each card, decide if it is an example of potential energy, kinetic energy, or both. Make 3 piles on your table.
Partner Talk Review What is potential energy? What is kinetic energy? Give an example of each.
#4 – Energy Conversions & Conservation Read pp. 222-225 and pp. 229-231. Answer the following questions in your spiral: Give an example of kinetic and potential energy being converted back and forth. Give an example of chemical energy conversion. Give an example of electrical energy conversion. What is a reason that not all potential energy is converted to kinetic energy on a rollercoaster? Why isn’t all kinetic energy converted to potential energy? What is the law of conservation of energy? Why is perpetual motion impossible?
Forms of Energy All energy falls into two categories: Potential: stored energy and energy of position Kinetic: motion of waves, electrons, atoms, molecules and substances.
Forms of Energy POTENTIAL KINETIC Chemical Nuclear Gravitational Radiant Electrical Mechanical Sound Thermal
How will we ever remember these?! Use this memory aid: Cam Newton got really excited making stinky tacos.
Cam= Chemical Newton= Nuclear Got= Gravitational Really= Radiant Excited= Electrical Making= Mechanical Stinky= Sound Tacos= Thermal
1. Cam=Chemical Energy stored in the bonds of atoms and molecules. Example: Matches, Digestion, batteries
2. Newton= Nuclear Energy stored in the nucleus of an atom. The energy that holds the nucleus together. Example: Breaking down Uranium
3. Got= Gravitational Energy of place or position. Higher = more gravitational energy. Example: two plants at different heights
4. Really= Radiant Electromagnetic energy that travels in waves like light. Example: Visible Light
5. Excited= Electrical Movement of electrons. Example: computer, phone
6. Making= Mechanical Movement of a substance from one place to another. Example: Riding a bike
7. Stinky = Sound Movement of energy through substances in waves. Example: bell ringing
8. Tacos= Thermal The vibration or movement of atoms and molecules. Heat. Example: boiling water`
What form of Energy?
What form of Energy?
What form of Energy?
What form of Energy?
What form of Energy?
What form of Energy?
What form of Energy?
What form of Energy?
What form of Energy?
What form of Energy?
Energy Conservation/ Transformation Energy cannot be created nor destroyed. It can only change from one form to another.
Matching activity Match each card to the correct energy transformation.