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15 Cards in this Set
- Front
- Back
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What is related to force and motion?
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work
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For _____ to take place, an object, or load, must move as the result of force acting upon it in the direction of its movement
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work
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Work is defined as:________________ . In this formula, force is equal to the weight of the load.
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force x distance = work
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Work is increased in two ways: an increase in the _____ of the load and an increase in the ________moved.
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weight, distance
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Friction is a _______that takes place when one _______ slides against another.
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force ,surface
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_________ is helpful to us in many ways. ___________ allows us to slow down a car, grab an object, and stop when we are running.
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Friction, Friction
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Friction makes work more ___________. With friction we must increase _______ for work to take place.
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difficult, force
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Friction can be decreased in two ways: ___________ and ____________
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lubrication and wheels.
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Friction is _________ just before an object moves. This is called _________ friction.
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greatest, starting
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Friction ________ when an object is in ________. This is called sliding friction.
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lessens, motion, sliding
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Friction ________ when an object rolls on wheels. This is called _____________.
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lessens, rolling friction
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The amount of friction depends upon the amount of _______ between the two objects or surfaces. Therefore, _________objects create more friction when being moved and lighter objects create less friction when being moved.
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force, heavier
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Tools make work easier because they _______ ___ ______ applied to the work.
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change the force
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Tools magnify force and ______ ___ ______ of the force.
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alter the direction
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With tools we can do work with ________ ______ ____ _______.
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less force or effort
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