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Year In Review (8th grade)

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  • True or false: An object accelerates when it speeds up, slows down, and changes direction.
    True
  • Is this a complete and accurate position? The adorable dog is 10 feet to the left of the angry cat.
    Yes, there is distance, direction, and reference point.
  • a type of mixture that is mixed evenly
    homogeneous mixture
  • When are the distance and displacement of an object equal?
    when motion is in a straight line
  • What type of properties can be measure WITHOUT changing the identity of the matter: physical or chemical
    physical properties
  • It takes more force to move a heavier object. Which of Newton's Laws does this describe?
    Newton's 2nd Law: F = MA
  • When you push against a wall, the wall pushes back against you. Which of Newton's Laws does this describe?
    Newton's 3rd Law of Motion: Every action has an equal yet opposite reaction.
  • If a soccer ball is sitting motionless on the ground, what type of force would cause it to move?
    unbalanced force
  • Speed measures how fast something is going, velocity measures that and what else?
    the direction the object is traveling
  • In a tug of war, someone pulls with 20 N of force, and the other person pulls with 30 N of force. Is this a balanced or unbalanced force?
    unbalanced
  • What are the electrons on the outer electron shell of an atom called?
    valence electrons
  • A substance made of only one type of atom.
    element
  • At the top of the highest hill of a rollercoaster, is there more potential or kinetic energy?
    more potential energy because it is higher off the ground
  • As you move down the rows of the periodic table, what gets added each row?
    a new electron shell
  • Is speed a scalar or vector quantity?
    scalar
  • Name 2 of the 6 types of simple machines
    inclined plane, wedge, screw, wheel and axle, pulley, lever
  • A phone is sitting motionless on the table until you baby brother pushes it off the table. Which of Newton's Laws does this represent?
    Newton's 1st law: An object at rest will stay at rest unless acted on by an unbalanced force.
  • What is the measurement of the change in velocity over time?
    acceleration
  • What are the 3 things needed to describe a position?
    distance, direction, reference point
  • type of matter in which atoms are far apart and collide with each other
    gas
  • At the bottom of the highest hill of a rollercoaster, is there more potential or kinetic energy?
    more kinetic energy because it is moving the fastest
  • What is a push or pull on an object and is measured in Newtons?
    force
  • type of matter in which the atoms are packed tightly together and vibrating back and forth quickly
    solid
  • What is a vector quantity?
    measures magnitude (how much) and direction
  • What is the purpose of a simple machine?
    to make work easier to do
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