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### 15 Cards in this Set

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