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Energy and Magnetic Forces
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When all of the __________ in a material are arranged in the same direction, the material become a permanent magnet.
magnetic domains
Is work done on the barbell? Why or why not?
No, no movement so no work is done
Is work done on the wagon? Why or Why not?
Yes, the wagon moves in the direction of the force applied
Three rock climbers are climbing the side of a mountain. One is 100m above the ground. Another is 200 m above the ground and the third is 300 m above the ground. Which has more energy? Why? (Assume they're the same mass.)
300 m because this rock climber has more height
Work in the transfer of ________ from one object to another.
energy
In order to do work on an object, the force you exert must be in the _______ direction as the object's motion.
same
When you rub your hands together on a cold day, you use friction to convert mechanical energy to _____________.
thermal energy
What is an example of chemical potential energy?
battery, food, burning fuel such as gasoline
What happens as an object’s height increases? The potential energy ______________.
increases
A stretched rubber band has ___________ potential energy.
Elastic
Potential energy due to the position of an object above Earths’ surface is called _______ potential energy.
Gravitational
The ______of an object is calculated from the velocity and the mass of the object.
Kinetic Energy
_______is the energy an object has due to its motion.
Kinetic Energy
A bicycle on top of a hill, a book held over your head, and a stretched spring all have______________.
Potential Energy
The stored energy an object has because of its position or state.
Potential Energy
Do electrons have a positive or negative charge?
Negative
What machine in hospitals uses magnets?
Magnetic Resonance Imaging (MRI) Machine
What is thermal energy?
Energy that produces heat
What does maglev use to move a train forward?
Magnets
What does the magnetosphere protect the earth from?
Solar winds (Harmful rays from the sun)
When you sprinkle iron shavings around a magnet what does it reveal?
It reveals a magnetic field.
Is magnetism a contact or non-contact force? Why?
Non-contact because it moves an object without touching it.
True or False: a force applied to an object ALWAYS changes the object it acts on.
False
Is magnetism a push or pull force or both?
both
What is a magnetic field?
The area around a magnet that attracts objects to the magnet.
True or false: a compass uses magnets.
true
Opposite poles of a magnet attract or repel?
attract
What are the two ends of a magnet?
North pole and south pole.
Same poles of a magnet attract or repel?
Repel
How many poles does a magnet have?
Two
Is gravity a contact or non-contact force?
Non-contact
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