Heat
What is heat?
Energy moving from warmer to cooler objects.
How does light travel? What shape?
Light travels in waves - in straight lines or rays.
What makes sound?
VIBRATIONS! Something that moves back and forth quickly
At what temperature on the Celsius scale does water boil and freeze?
Boil at 100 C and freeze at 0 C
How do you change the size of the shadow you're casting?
The shadow will look bigger as you get closer to the light and smaller as you move away from the light.
What is an insulator? Give an example.
An insulator is a material that cannot transfer heat well. Example: cotton, wool, rubber, wood, etc.
How are rainbows formed?
The rain acts as prisms and separate the white light(sunlight) into all of the colors of the rainbow.
What material does sound travel slowest and fastest in?
Sound travel slowest in a gas. Sound travel fastest in dense solids such as rocks.
Where can we not hear sounds?
Outer space because sound needs gas, liquid, or solid particles to travel in!
Why does the board look white?
It is reflecting all of the lights to our eyes.
What are the three ways to transfer heat? Give an example of each.
Conduction: fire touching pot Convection: transfer through liquid or gas Radiation: sun's heat and light felt on Earth
Why do we see the color black?
We see black because it absorbs all of the colors and does not reflect any colors to our eyes.
If you can draw sound energy, how will it look like?
It will look like a wave.
Draw a convex and concave lens and show how light will travel through them.
Concave (rays spread out)
What is a good conductor?
metal (gold, copper), diamonds
How will the particles in a cold object move when a warmer object touches it?
The particles in the cold object will move faster as it become warmer.
How are refraction and reflection different? Give examples.
Refraction is the bending of light as it passes through another material. Example: binoculars, glasses, telescopes Reflection is the bouncing of light off of a shiny and smooth surface. Example: mirrors, water, windows,
Why can we hear Mr. Proud when he speaks? (explain what happens)
His vocal cord is vibrating which allows him to speak. The reason we can all hear him is because sound waves travel to our ears
When the sound source moves, the frequency changes. ie. police car siren sounding lower pitch AFTER the car passes. This is called the..
Doppler Effect
What tool do doctors use to listen to your heart beat? How does it work?
The Stethoscope - Vibrations hitting the chestpiece are funneled into a narrow tube, amplified and moved to the eardrum.
What happens to the size of an object when it is heated? Give an example.
Usually, the object will expand, or get larger because the particles in the object are moving faster and need more space. Example: mercury/alcohol expands in a thermometer cement on the ground expands on hot days
What light waves in the Electromagnetic Spectrum (EM) can we NOT see? Name them.
radio waves, microwaves, infrared, ultraviolet, x-rays, gamma (we can only see VISIBLE light or white light)
What is "frequency"? What does it determine? Draw two sound waves to show one that has higher frequency.
Frequency is the NUMBER OF TIMES A SOUND VIBRATES IN 1 SECOND. It determines pitch (how high or low a sound is).
Spread out areas or areas of decreased pressure on a sound wave are known as a .....
rarefaction
How do ears work?
sound waves travel inside our ears, causing our ear drums to vibrate, which makes the little bones in our ears vibrate, which makes the little hairs inside our ears to vibrate, which then creates nerve signals to our brains. Finally our brain perceives the waves as sound.