Static Electricity
What happens when two objects have opposite charges?
They attract.
What happens when two opposite magnetic poles are near each other?
They attract.
What does a wave carry from one place to another?
Energy
A sound with a high frequency has what kind of pitch?
High pitch
When a wave bounces off a surface, it is called what?
Reflection / reflected
What happens when two objects have the same charge?
They repel.
What happens when two like magnetic poles are near each other?
They repel.
What part of a wave tells how tall the wave is?
Amplitude
What does a sound wave need in order to travel?
A medium
A sound wave passes through a door. What happened to the wave?
It was transmitted.
You rub a balloon on your shirt and it sticks. Why?
The balloon and shirt develop opposite charges and attract.
Name one way to make an electromagnet stronger.
Add more coils or use more/bigger batteries.
If the amplitude of a wave increases, what happens to its energy?
It increases.
Which has the higher pitch: a high-frequency sound or a low-frequency sound?
High-frequency sound
If sound enters a material and does not bounce back or pass through, what happened to the sound?
It was absorbed.
During lightning, what moves between positively and negatively charged parts of clouds?
Charged particles
An electromagnet has 10 coils. If you increase it to 30 coils, what should happen to its magnetic strength?
It should become stronger.
Which has the shorter wavelength: a high-frequency wave or a low-frequency wave?
High-frequency wave
Two sound waves have the same frequency, but Wave A has a larger amplitude. Which one sounds louder?
Wave A
A beam of light goes from air into water and changes direction.
What caused the change?
A change in medium/media
Two negatively charged balloons are near each other. You add even more negative charge to both balloons. What will happen to the repelling force?
The repelling force becomes stronger.
You can choose:
1 battery + 2 coils,
1 battery + 20 coils,
2 batteries + 2 coils,
2 batteries + 20 coils.
Which makes the strongest electromagnet?
2 batteries + 20 coils
Wave A has a wavelength of 2 m.
Wave B has a wavelength of 0.5 m.
Which wave has the higher frequency?
Wave B, the 0.5 m wave
A student makes a wave with a rope. They move their hand up and down with more force.
What happens to the amplitude?
The amplitude increases.
A room becomes quieter because curtains and carpet stop much of the sound.
Are the curtains and carpet mostly reflecting, absorbing, refracting, or transmitting the sound?
Absorbing