DAY 159
If you missed today's Zoom, a video lesson for today is here: https://youtu.be/68F0WsessyM
GOALS: swbat...
1. observe that light can only be seen when it bounces off an object
2. describe which filters transmit certain colors, and which absorb colors
3. see that two filters can combine to affect the color of transmitted light
WARM-UP (4 minutes)
1. Natural philosophers have long pondered the underlying reasons for color in nature. One common historical belief was that colored objects in nature produce small particles (perhaps light particles) that subsequently reach our eyes. Different objects produce different colored particles, thus contributing to their different appearance. Is this belief accurate or not? _____________ Justify your answer.
2. Let's say your red shirt produced those red particles. That would explain why you can see the shirt. But, wouldn't the shirt make particles all the time? And if it was making particles all the time, are there any unexpected times of the day when it would be bright and visible? Also, if particles are coming out of the shirt, would the shirt stay the same size forever?
3. What color does a red shirt appear when the room lights are turned off and the room is entirely dark? ____________ What about a blue shirt? ____________ ... a green shirt? ____________
CLASSWORK
1. 159A: Colors: How Do They Interact?
- Please read the instructions on the Color Vision Simulation
- read handout, answer questions, and solve problems.
- The assignment is on Schoology.
Unable to access today's CW assignment? Here's the backup LINK
ESSENTIAL QUESTION: How can we build a motor out of magnets, wire, and a battery?
Goals: SWBAT...
1. Define resistance and Ohm's Law
2. explain why a switch must be closed in order for current to flow
3. describe how electrons flow in a circuit
4. create a successful simple circuit
WARM-UP (4min)
1. Answer "pre lab" questions 1-4 (assignment is on Schoology)
CLASSWORK
1. HW Review
What causes things to move? Pressure. For electrons in a wire, that pressure is called voltage. An AA or AAA battery has 1.5V of pressure
What resists movement? Friction. For electrons in a wire, increased resistance slows their movement, and increases the temperature. (think about an iron or electric stove)
result of these... current (the flow of charge or the flow of electrons)
2. 159A: Circuit Simulation Lab
Lab / instructions are on Schoology. Complete in class today
Can't access the lab for today on schoology? Here's a backup link (LINK)
LEARNING AT HOME (HW)
What is current? How can we calculate the current flow through a wire? All will be answered.....in the 1st Flipping Physics video ever :-)
----->LINK
Questions:
1. Define "current"
2. Which of the following flows in wires? Proton, Electron, Neutron?
3. What is the direction "conventional current" would flow?
4. Copy the image of the Bohr Model of the atom. Where are the electron shells?
5. What's actually flowing, positive or negative charges?
6. So, again, which way does current flow?
7. Energy gets transmitted from a power plant to our homes/school via AC, but most of our devices use a transformer to convert to DC. Why?
8. Solve the current problem ("A") along with Mr. P
9. In the equation, Q=ne what do each of the variables (letters) stand for?
10. Solve for the number of electrons flowing through the wire
11. is that a lot of electrons?