Full Name – 5/19/2014 Homeroom Aims: SWBAT describe why objects are different colors. Do Now: 1. What’s the difference between kinetic and potential energy? 2. If you drop a bowling ball and a tennis ball from 5 feet, why will the bowling ball make a dent in the floor while the tennis ball won’t? Don’t they have the same potential energy? 3. Find the kinetic energy (E k = 0.5 * mass * velocity 2 ) of a ball weighing 10 kg and traveling at 8 m/s.

Aims: SWBAT describe why objects are different colors. Agenda: Entrance Procedures (8 min) Colors [I do] (15 min) Absorption & Reflection [We do] (5 min) How you see [You do] (15 min) Closing (5 min)

Silently pass in your Homework You have 15 seconds.

Silently pass in your Homework You have 15 seconds.

Do Now 1. What’s the difference between kinetic and potential energy? Kinetic energy is moving. Potential energy is stationary but deals with height. They both deal with mass. 2. If you drop a bowling ball and a tennis ball from 5 feet, why will the bowling ball make a dent in the floor while the tennis ball won’t? Don’t they have the same potential energy? The bowling ball has more potential energy because it’s heavier. 3. Find the kinetic energy (E k = 0.5 * mass * velocity 2 ) of a ball weighing 10 kg and traveling at 8 m/s. E k = 0.5 * 10 * 8 2 = 320 J

Hook 1) Why are leaves green?

Why do colors exist? (I do) Scientists use _______ to break light into a spectrum of colors. prisms

Why do colors exist? (I do) ROYGBI V The spectrum of visible light is called ROYGBIV: You can see ROYGBIV in a rainbow! eded rangerange ellowellow reenreen luelue ndigondigo ioletiolet Different colors of light have different ______________. Wavelengths are measured in ___________________ – 1 billionth of a meter. wavelengths nanometers (nm) 650 nm 590 nm 570 nm 510 nm 475 nm 445 nm 400 nm

Why do colors exist? (I do) The light you see is what’s ___________ from an object. Black objects absorb all ______________. White objects reflect _________________. reflected colors of light all colors of light

Why do colors exist? (I do) Leaves are ______ because they absorb all the _________________, which has more energy. They reflect the ___________, because it has very ____________. green red and blue light green light little energy

Why do colors exist? (I do) Red objects absorb everything but _________. Blue objects absorb everything but _________, etc. blue light red light

Why do colors exist? (I do) 1) A police officer’s blue suit: Blue light is reflected; everything else is absorbed. 2) An astronaut’s orange suit Orange light is reflected; everything else is absorbed. 3) A stop sign Red light is reflected from the sign, but all light is reflected from the word “Stop” 4) A soccer ball All light is reflected from the white pentagons, and all light is absorbed into the black ones.

Absorption & Reflection (We do) 5) You’re part of an interstellar exploratory mission. You land on one of the planets orbiting Alpha Centauri, the closest star to our solar system. There’s life on the planet but all the plants are blue! What can you assume about Alpha Centauri that’s different than the Sun?

Exit Slip: 1) Why are most plants green? 2) What does ROYGBIV stand for? 3) Why are images the eye sees upside down? Homework: What causes rainbows? Sneak Preview!__________________ Interacting with light