Sound
What is sound made of and produced by?
Waves and vibrations
What is light made of?
photons
What does a force do?
Make something move, stop, speed up, slow down, or change directions
What are the three types of contact forces?
Push, pull, friction
Explain the difference between high and low frequency and high and low volume
Frequency is the pitch, and volume is how loud.
Define opaque, transparent and translucent
Opaque - no light goes through
Translucent - some light goes through
Transparent - all light goes through
When a soccer ball slows down as it rolls along the grass what force is this an example of?
Friction
What are the two types of non-contact forces?
Magnetism and gravity
What is it called when you hear sound being reflected?
Echo
Things that produce their own light are called
Emitters
You push a ball forward, but then it hits a wall and bounces backward. What caused the ball to change direction?
A push force from the wall.
An apple falls from a tree and hits the ground. What two forces are happening in this scenario?
Gravity - the apple falling
Push - the apple hitting the ground
How does an echo happen?
Large room, hard walls, not a lot of materials that absorb sound
What is reflection, refraction and absorption?
Reflection - light bounces off a surface
Refraction - light bends and changes directions going through
Absorption - light is absorbed
If a heavy bowling ball and a light tennis ball are dropped at the same time which one would hit the ground first? Why?
The same time, because gravity pulls on all objects equally.
If two students are playing tug of war and the rope is not moving what does that tell you about the force being applied. What force is being used in tug of war?
Pull force. If the rope is not moving the forces are balanced/equal.
What are 3 negative impacts of noise pollution?
Hearing loss, increased stress, worse results at work and school, increased blood pressure, etc.
What are 3 negative impacts of light pollution?
Animals can become confused by artificial light (sea turtles), impacts our natural sleep cycle, damage eye sight, increased pollution for energy, etc.
If you slide a book on the table and on the ice with the same amount of force, which would go further and why?
The ice because it is a smoother surface and would result in less friction.
A book is sitting on the table. If gravity is pulling the book down, why doesn't it fall through the table?
The table is pushing on the book with an equal force.