Unit 5 - Force and Motion / Work & Machines
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| balanced force | forces on an object that are equal in size and opposite in direction
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| effort distance | distance over which the effort is applied
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| effort force | the force applied to the machine
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| force | a push or pull that changes motion
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| gravity | an attractive force between any objects that depends on the masses of the objects and the distance between them
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| inertia | the tendency of an object to resist any change in its motion
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| machine | a device that makes work easier
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| net force | the sum of forces acting on an object
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| Newton’s 1st law | states that an object moving at constant velocity keeps moving at that velocity unless an unbalanced force acts on it
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| Newton’s 2nd law | states that the acceleration of an object is in the same direction as the net force on the object and can be calculated by F=ma
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| Newton’s 3rd law | states that when one object exerts a force on a second object, the second one exets a force on the first that is equal in strength and opposite in direction
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| resistance distance | the distance required by the machine to move the object
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| resistance force | the force applied by the machine
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| weight | the gravitational force exerted on an object
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| work | a force applied over a distance that causes a change in motion
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| mechanical advantage | ratio of the output force exerted by the machine to the input force applied to the machine
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