Science Study Guide - Magnetism

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Science Study Guide - Magnetism
2015-03-23 19:33:15
3rd Grade Science

Science Test Study Questions
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  1. Why does a refrigerator magnet only stick to metal on one side?
    They are thin strips of metal, one side is strong and the other side is weak.
  2. Any object with magnetic force.
  3. An area of magnetic force around a magnet.
    Magnetic Field
  4. The force that pulls certain objects toward a magnet.
    Magnetic Attraction
  5. What happens when magnets repel each other?
    They push each other away.
  6. What happens when magnets attract each other?
    They pull each other together.
  7. What is "magnetic force"?
    The force that pushes magnets apart or pulls them together.
  8. What are the "poles" of a magnet?
    The parts of a magnet where the magnetic field is strongest. North and South Poles.
  9. When magnets are far apart, they do not push or pull enough to move each other. Why?
    The magnetic force is weak when they are far apart.
  10. What is the difference between a permanent magnet and a temporary magnet?
    A temporary magnet loses its magnetic properties. A permanent magnent always has magnetic force.
  11. Give 3 examples of magnets at attract.
    • 1. Nickel
    • 2. Iron
    • 3. Cobalt
  12. Give 2 examples of metals that magnets do not attract.
    • 1. copper
    • 2. aluminum
  13. Where is a magnet's magnetic field strongest?
    The north pole and the south pole
  14. How could you use a magnet to find the North Pole?
    Use a magnet to see which way the north pole points ... a compass is an example of this.
  15. Forces that cancel each other out when acting on the same object.
    Balanced Force
  16. Forces that cause a change in motion.
    Unbalanced force
  17. What is force?
    A push and pull
  18. How can forces effect an object's motion?
    They make objects start moving, speed up, slow down, stop moving or change direction
  19. What happens when you kick a moving ball?
    It changes direction.
  20. A black puppy and a yellow puppy are fighting over a toy and are pulling on both at the same time. If the yellow puppy pulls twice as hard as the black puppy, what will happen?
    The toy will pull toward the yellow puppy.
  21. If a steel ball is placed between 2 magnets of equal strength, will the ball move? Why?
    No, because the forces on the ball are balanced.
  22. Look at the diagram on page 332. How do force and mass affect the movement of the cart?
    • 1. If you apply force to an object, it will move.
    • 2. If you apply twice the force, the object moves twice as far.
    • 3. If you have twice the mass, the object will move half as much.
  23. Ellie uses a small amount to kick a soccer ball. If she used twice the force in a second kick, will the ball move farther? Explain your answer.
    It will move farther. When you use twice the force, it will move twice as far.
  24. Captain Sain, Carolyn, Mary Beth and Raygan push very hard on a cardboard box. However, it is not moving. Give evidence as to why you think this can happen.
    The box must weigh as much or more than the people trying to push it. They are balanced forces.
  25. What effect does a contact force have on objects?
    It changes the object's motion.
  26. To move back and forth quickly.
  27. A form of energy that comes from objects that vibrate.
  28. How loud a sound is
  29. How low or high a sound is
  30. How do sound waves travel?
    Sound waves travel through matter.
  31. What state of matter does sound travel through the slowest?
  32. What state of matter does sound travel through fastest?
  33. Why do you think you can't hear sound in outer space?
    Because sound cannot travel in empty space, and outer space has no gas, liquids or solids to transfer sound waves.
  34. What makes loud sounds?
    Objects that vibrate with a lot of energy.
  35. If an object vibrates quickly, what kind of pitch will it have?
  36. If an object vibrates slowly, what kind of pitch will it have?
  37. Look at the diagram of the ear on page 244. Explain how sound waves travel through your ear.
    • 1. Sound waves collect in the outer ear.
    • 2. The sound waves makes the eardrum vibrate.
    • 3. This causes three tiny bones in the inner ear to vibrate.
    • 4. These vibrations pass through the inner ear to the nerves.
    • 5. The nerves send a message to the brain.
    • 6. You hear a sound.