Gravitational Force
This force, which pulls objects toward the center of the Earth, will increase as objects gets larger.
What is gravitational force?
These three tiny particles (made up of protons, neutrons, and electrons) make up all matter. What are they called?
What are atoms?
This type of electricity is the buildup of electric charges that do not move or flow continuously.
What is static electricity?
This invisible area of force surrounds a magnet and allows it to attract or repel certain materials.
What is a magnetic field?
What do electric, magnetic, and gravitational forces all have in common?
What is they act at a distance (without touching)?
The acceleration due to gravity on Earth is approximately this value in meters per second squared.
What is 9.8 meters per second squared?
An atom is neutral when it has an equal number of these two charged particles.
What are protons and electrons?
When two uncharged objects rub against each other and electrons move from one to the other, the objects become charged through ____.
What is friction?
Every magnet has these two poles that behave like opposites—one attracts the other, but similar ones repel.
What are the north and south poles?
When a paper clip or nail becomes magnetic only while touching a permanent magnet, it is acting as what type of magnet?
What is a temporary magnet?
The strength of gravity between two objects depends on their masses and this other factor.
What is distance?
When an atom gains extra electrons, what kind of charge does it have overall?
What is a negative charge?
When you rub a balloon on your hair, electrons move from your hair to the balloon. What kind of charge does the balloon end up with?
What is a negative charge?
In most materials, tiny magnetic fields from atoms (called magnetic domains) cancel each other out. In magnetized materials, however, these atomic fields do this instead.
What is align in the same direction?
The phrase “opposites attract” applies to which TWO kinds of forces?
What are electric and magnetic forces?
As two objectives move closer together, their gravitational pull on each other becomes _.
What is stronger?
Objects with the same type of charge do this when they are near each other.
What is repel each other?
After rubbing a balloon on your hair, the balloon sticks to your hair. Why does this happen?
Because the negatively charged balloon is attracted to the positively charged hair. (Attraction of opposite charges).
Magnets that keep their magnetic properties without electricity are called what?
What are permanent magnets?
The strength of an electric field depends on two main factors: the amount of charge and this variable related to how far apart the objects are.
What is the distance between the charges?
All objects have a specific quantity of matter. We measure this as a value called ___. Any object with this will exert a gravitational pull.
What is mass?
These lines show the direction of electric force, always pointing away from positive charges and toward negative charges. What are they called?
What are electric field lines?
This dramatic display in the sky is a large-scale example of static discharge that happens when electrons move from charged clouds to the ground.
What is lightning?
A compass works because its needle aligns with this invisible force surrounding our planet.
What is Earth’s magnetic field?
These magnets can be turned on or off using electricity (from a source like a battery) and are often used in junkyard cranes.
What are electromagnets?