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Chapter 11: Exploring Forces

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  • A baseball going at the same speed as a tennis ball has more _________ because it has more mass.
    momentum
  • An object’s __________ is its location compared to other things.
    position
  • Energy of motion is called ______.
    kinetic energy
  • Dividing the output force by the effort force equals the ___________ of a simple machine.
    mechanical advantage
  • Energy that is stored is called ____________.
    potential energy
  • What is a strong push in the direction opposite an object’s weight?
    thrust
  • What is a simple machine in which the output force is between the effort force and the fulcrum?
    second-class lever
  • What do we call a combination of devices that make it easier to do work?
    Compound machine
  • What is a simple machine in which a fulcrum lies between the effort force and the output force?
    first-class lever
  • What is the metric unit used for measuring force?
    Newton
  • The length between two places is called _______.
    distance
  • In order to push or pull an object, a(n) ___________ must be applied to the object.
    force
  • What is a push or pull that causes a change in motion of an object?
    Unbalanced force
  • What is a simple machine made of an inclined plane wrapped around a central bar?
    screw
  • An object’s speed and its direction of motion indicate its ___________.
    velocity
  • What is the measure of the amount of matter in an object?
    Mass
  • The ratio of the work done by a machine to the work put into the machine is known as its ____________.
    efficiency
  • What do we call the amount of work done per unit of time?
    Power
  • An object in space that has moved beyond the pull of gravity experiences ___________.
    weightlessness
  • What is the force that opposes the sliding of an object over a surface?
    Sliding Friction