Falcon Focus • (8-5.6) According to inertia, a moving object, if no forces act on it, will ____. • A. eventually come to rest • B. eventually change direction • C. slow down but never completely stop • D. remain in motion • • (8-5.6) A book sliding across a floor eventually comes to rest because ___. • • A. there are no forces acting on it • B. there are outside forces acting on it • C. of balanced forces • D. of the mass of the book
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Falcon Focus (8-5.6) According to inertia, a moving object, if no forces act on it, will ____. A. eventually come to rest B. eventually change direction.
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Falcon Focus• (8-5.6) According to inertia, a moving object, if no forces act on it, will ____.• A. eventually come to rest• B. eventually change direction• C. slow down but never completely stop• D. remain in motion• • (8-5.6) A book sliding across a floor eventually comes to rest because ___.• • A. there are no forces acting on it • B. there are outside forces acting on it• C. of balanced forces• D. of the mass of the book
Essential Question
• (8-5.5) What are the difference between balance an unbalance forces? Give an example of each.
Waves 8-6.8
Electromagnetic Waves
Electromagnetic Waves• Transverse waves without a medium! • (They can travel through empty space)
• Electromagnetic waves travel VERY FAST – around 300,000 kilometres per
second (the speed of light).
At this speed they can go around the world 8 times in one second.
Electromagnetic Spectrum• Electromagnetic waves have a wide range of
wavelengths. The entire range of wavelengths is called the electromagnetic spectrum. The relationship between the wavelength and energy of waves in various parts of the electromagnetic spectrum can be shown as follows:
Ultraviolet Radiation• Ultraviolet Radiation Is the range of
electromagnetic waves with frequencies higher than violet on the visible spectrum, thereby having shorter wavelengths and more energy than violet wavelengths
• Because of the high energy of ultraviolet radiation, too much exposure is damaging to the eyes and skin
• Used to kill bacteria.
(Sterilization of equipment)
• Too much can cause skin cancer.• Use sun block to protect against (UV
rays)
• Causes your skin to produce
vitamin D (good for teeth
and bones)
X- RAYS• Shorter
wavelength and higher frequency
than UV-rays• Carry a great
amount of energy• Can penetrate
most matter.
Bones and teeth absorb x-rays. (The light part of an x-ray image indicates a place where the x-ray was absorbed)
Too much exposure can cause cancer
(lead vest at dentist protects organs from
unnecessary exposure)
• Used by engineers to check for tiny cracks in structures.– The rays pass
through the cracks and the cracks appear dark on film.
Create the Following ChartElectromagnetic Waves Facts Examples
Radio waves (Real) Radio Waves sends Signals Radio, TV Reception, MRI, Satellite Dish, Car Radio, CB Radio, & Radio Tower
Microwaves (Men) Can be used to send a microwave communication and to cook
Disk-like antennas on tower and a Microwave
Infrared (In) Keep food hot, Communicate with TV, or anything that produce heat
Lamps, Remote Control, Vegetation (trees, grass),
Visible Light (Roy-G-Biv)(Violet)
Anything with colors Rainbow, pictures, & etc…
Ultraviolet Rays (Underwear Are) Tan our skin and comes from the Sun Tanning Salon, UV Rays from the Sun
X-Ray (Extremely) Used to study bones and treat Cancer X-Ray and Stars
Gamma Rays (Gorgeous) Is given off by nuclear explosions that occur within stars, like our sun & Kills Sick Cells and Bacteria/Sterilize Equipments
Stars and Nuclear Explosion
• Electromagnetic Spectrum—name for the range of electromagnetic waves when placed in order of increasing frequency
RADIO WAVES
MICROWAVES
INFRARED RAYS
VISIBLE LIGHT
ULTRAVIOLET RAYS
X-RAYS
GAMMA RAYS
Waves Town Activity
• Brief SUMMARY• A. All electromagnetic waves travel at the same
speed. (300,000,000 meters/second) in a vacuum.
• B. They all have different wavelengths and different frequencies.– Long wavelength-lowest frequency– Short wavelength highest frequency– The higher the frequency the higher the energy.
Falcon Focus
• (8-6.2) Which are mechanical waves?• A. light waves• B. Microwaves• C. Sound waves• D. Radio waves• • (8-6.2) A ___ wave can travel in the absence of matter.• A. light • B. sound• C. seismic• D. water
Essential Question
• (8-5) How would you explain how gravity and friction affects objects?
Create the Following chart
Color of Light Colors ReflectedWhiteRedBlueGreenBlack YellowClear
Chart Conclusion
• 1st: Explain what do you know about reflection and absorption of colors of light.• 2nd: Give an conclusion base on
the results of your data or what you observed.
Falcon Focus
• (8-6.3) In the diagram (pg. 67) in which position would the fish appear to someone looking at if from above the surface of the water?
• • A. A• B. B• C. C• D. D
Essential Question
• (8-6.1) What is a wave and how is a wave created?