Define the Forces
What are the two poles that a magnet has?
A north and a south
What is mass?
How much matter is in an object
Electric current produces a _______ ________.
magnetic field
DAILY DOUBLE!!! Define magnetic FORCE
The push or pull between a magnet and an object that is iron or contains iron
If a south end and a south end are next to each other, will they attract or repel?
Repel
What is an electric FIELD?
The area around a charged object that interacts with other charged objects.
What is weight?
The force of gravity on an object due to its mass
How does an electromagnet create a magnetic field?
Copper wire is wrapped around an iron core then attached to a power source (battery). When the current passes through the wire the iron core becomes magnetized.
What happens when you have two negative charges next to each other: will they attract or repel?
repel
What device does a motor and generator need in order to work?
an electromagnet
The Earth can be described as a giant ______
Magnet
Describe the charge distribution on a neutral sphere when a negatively charged rod is touching it, giving it a negative charge. *must also tell the type of charge distribution*
The neutral sphere will be charged due to conduction. This will cause the neutral sphere to become negatively charged.
Explain why you don't see objects moving towards another on a small scale.
Either their masses are too small or their distances too great.
DAILY DOUBLE!! In an electromagnet, how can the strength of the magnetic field be increased? *must give all 3 ways*
1-increase the size of the iron core
2-increase the number of coils in the wire
3-increase the size/number of dry cells (batteries)
What objects have gravity?
All objects with mass
When is magnetic force the strongest and how do you increase that strength?
Magnetic forces are strongest when objects are close together. To increase the strength of the magnetic force, place the objects closer together.
What do friction, induction, and conduction have in common?
They are all ways to transfer electric charge
What is the difference in gravitational, electrical, and magnetic fields?
Gravitational fields only attract. Electrical and magnetic fields attract and repel.
What is the difference in a motor and generator? Be specific!
The difference is how each device transforms energy. A motor starts with electrical energy and transforms it into mechanical energy. A generator starts with mechanical energy and transforms is into electrical energy.