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Force, Mass, and Acceleration Review Force ____________________________ Force Force causes an object to begin to move, direction. stop moving, or change Acceleration Acceleration is ___________________ Acceleration Acceleration is an increase in speed, decrease in speed, or change in direction. Mass Mass is ________________________ Mass Mass is the amount of matter in an object. Newton’s Second Law of Motion Newton’s Second Law of Motion explains how force, mass, and acceleration are related. It states that the net force on an object is equal to the product of its acceleration and its mass Force = Mass x Acceleration Newton When acceleration is measured in meters per second per second and mass is measured in kilograms, force is measured in kilograms x meters per second per second. This long unit of measure is called the Newton (N). The Newton is named in honor of Isaac Newton. One newton equals the force required to accelerate one kilogram of mass at 1 meter per second per second. The formula is 1N = 1 kg x 1m/s Try it… If you have a 52 kg water skier who is being pulled by a speedboat and her acceleration is 2 meters/second/second, all we need to do is substitute mass and acceleration. Force = 52kg x 104N Mass x Force 2 m/s = Acceleration = Changes in Force Suppose you are pulling a wagon full of rocks and you want to increase the acceleration (speed) of the wagon. You can do one of two things. You can increase the amount of force used to pull the wagon (pull harder) or decrease the amount of mass (take some of the rocks out of the wagon). Suppose you are pushing your younger brother/sister on a small bicycle and it is going too fast. You would want to decrease the acceleration (slow it down) by doing one of two things. You can decrease the amount of force (don’t push as hard) you use to push the wagon or increase the amount of mass (add another child). Examples Read your paper and based on what we just talked about, answer the questions.