Magnets
True
What happens when two different materials are rubbed together?
Electrons are transferred
What materials do you need to make an electromagnet?
nail, copper wire, battery
Gravity is a force that ___________
pulls
they hit the ground at the same time
What happens if you put two like poles together?
They repel.
If an object has more electrons than protons then what is its charge?
Negative charge
How do electromagnets work?
there is an electric current that flows through the electromagnet causing a magnetic field in the coils
What is mass?
How much matter something contains.
How are electromagnets different than permanent magnets?
electromagnets you can turn on and off
Where is the magnetic force the strongest in a magnet?
the poles
___________ is a property of matter that creates electric and magnetic forces and interactions
electric charge
What are two ways that you can strengthen an electromagnet?
Increase the number of coils, have an iron core, thicker wire, stronger battery, more batteries
What is gravity?
the force by which a planet or other body draws objects toward its center.
What two factors affect the strength of static electricity?
charge and distance
How do compasses work?
A compass contains a magnet that aligns to earth's poles.
Positive charges are drawn with the arrows pointing in which direction?
Away
List three manmade machines that utilize electromagnets.
mag levs, wrecking yard electromagnets, MRI machines, cell phones, computers, etc.
Why is a baby's weight more on Earth than on Mars?
Earth has more mass, so gravity exerts a greater force.
What are two ways that the poles of magnets are similar to electrons and protons?
They both have fields
Opposites attract while likes repel
Draw a magnetic field around a bar magnet.
looks like a circular motion of arrows from north to south pole
Draw the electric field when two protons are put close together.
Proton arrows point away from each other and do not connect.
Draw and label a diagram of how an electromagnet works.
Should have nail, battery, and wire coiled and each should be labeled.
What would happen if you fell through the earth?
You would fall all the way through then oscillate back to the center.
A platinum atom has 78 protons, 78 neutrons and 74 electrons, what is the atom's total charge?
positive 4 charge