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Physics Review

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  • m/s/s is the unit for what?
    acceleration
  • What is the purpose of a simple machine?
    to make work easier to do
  • When an object changes direction, is it accelerating?
    Yes, because velocity (which includes direction) is changing
  • two unequal forces are pushing on each other and there is a change in motion
    unbalanced force
  • a push or pull on an object
    force
  • the difference between the starting point and ending point of an object (a straight line)
    displacement
  • the total length an object has traveled between the starting point and ending point (doesn't have to be a straight line)
    distance
  • Give one example of a simple machine
    screw, inclined plane, lever, pulley, wedge, wheel & axle
  • Newton's Third Law of Motion
    Every action has an equal yet opposite reaction.
  • distance / time - What is this a formula for?
    speed
  • Newton's Second Law of Motion
    Force = mass x acceleration
  • When an object slows down, is it accelerating?
    Yes, because velocity is changing.
  • Watts is the unit for what?
    power
  • a change in position over time
    motion
  • change in velocity over time (velocity / time)
    acceleration
  • m/s is the unit for
    speed or velocity
  • Newtons is a unit for what?
    force
  • an object's distance and direction away from a reference point
    position
  • is speed a scalar or vector quantity
    scalar (only magnitude)
  • Joules is the unit for what?
    work
  • Newton's First Law of Motion
    An object in motion will stay in motion (An object at rest will stay at rest) unless acted on by an unbalanced force
  • the starting point you choose to describe the location, or position of an object
    reference point
  • 3 things that a position must include
    distance, direction, reference point
  • When are distance and displacement equal?
    when motion is in a straight line
  • two equal forces are pushing on each other and there is no change in motion
    balanced force
  • is velocity a scalar or vector quantity
    scalar (magnitude and direction)
  • What is the formula for work?
    force x distance
  • What is the formula for power?
    work / time
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