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Forces

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  • Forces that are equal in size and opposite in direction.
    Balanced Force
  • Force is measured in
    Newtons
  • Forces that occur when one force is greater than its opposite force
    Unbalanced force
  • Find how much work a mover would do if he used 50 Newtons of force to move a chair 10 meters (work=force X distance)
    500 Joules
  • Any push or pull that causes an object to move, stop, or change speed or direction.
    Force
  • Forces always act in __________________-
    Pairs
  • Power is measure in
    Watts
  • When two forces act on an object in the same direction, you _______________ the forces to get the net force.
    Add
  • The force that pulls all objects in the universe toward one another.
    Gravitation
  • _______________ = force X distance
    Work
  • What are the forces that affect objects on Earth every day?
    Friction, Gravitation, Magnetism
  • True or False: Earth is considered to be a huge magnet.
    True
  • The metric unit of work is the ___________________
    Joule
  • Name 3 simple machines.
    Wheel and axle, Pulley, Lever, Screw, Inclined Plane, Wedge
  • True or False: Balanced forces can either speed up, slow down, or stop an object.
    False
  • True or False: The strength of gravity depends on the mass of the objects and the distance between the objects.
    True
  • The force of attraction between magnets and magnetic objects.
    Magnetism
  • Something that makes a task easier by changing the size or direction of a force or the distance over which the force acts
    Machine
  • When two forces act on an object in opposite directions, you _________________ the forces to get the net force.
    Subtract
  • A force that opposes, or acts against, motion when two surfaces rub against each other.
    Friction
  • __________________ = work / time
    Power
  • When a(n) _________________ force is acting on an object it will seem as if no force is acting on the object.
    balanced
  • __________ machines are two or more simple machines put together.
    Compound
  • The use of a force to move an object through a distance.
    Work
  • The amount of work done for each unit of time.
    Power
  • How much power would it take for a person to do 64 Joules of work over 8 seconds? (Power=Work / Time)
    8 Watts
  • The result of two or more forces acting together on an object .
    Net Force
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