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Energy and Magnetic Forces

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