vf = vi + at
\nAs it happens, you know that acceleration and the time the car wasaccelerated over:
\nvf = 0 m/s + (4.60 m/s2)(5.00 s) = 23.0 m/s
\nBecause the acceleration was constant, the average speed is
\n![\"image6.png\"/](\"https://www.dummies.com/wp-content/uploads/331556.image6.png\")
Because vi = 0 m/s, this breaks down to
\n![\"image7.png\"/](\"https://www.dummies.com/wp-content/uploads/331557.image7.png\")
Plugging in the numbers gives you the average velocity:
\n![\"image8.png\"/](\"https://www.dummies.com/wp-content/uploads/331558.image8.png\")
Great now you know the force applied and the average speed. Suppose your brother got himself a snappy new car. Because work equals force times distance, you can write the equation for power the following way, ","noIndex":0,"noFollow":0},"content":"
In physics, you can calculate power based on force and speed. He was a contributing editor at PC Magazine and was on the faculty at both MIT and Cornell. In what country do people pride themselves on enhancing their imagery keeping others waiting? A thousand newtons! But if you suddenly got transported to outer space, the inward pressure of the air pushing on you would be gone, and all that would remain would be the 14.7 pounds per square inch your body exerted outward. Lets put it to the test.
\nYour brothers car has a mass of
\n![\"image3.png\"/](\"https://www.dummies.com/wp-content/uploads/331553.image3.png\")
On the big Physics Test Track on the edge of town, you measure its acceleration as 4.60 meters/second2 over 5.00 seconds when the car started from rest. force divided by distance. F net =a net . from its resting position. F=MA. \"https://sb\" : \"http://b\") + \".scorecardresearch.com/beacon.js\";el.parentNode.insertBefore(s, el);})();\r\n","enabled":true},{"pages":["all"],"location":"footer","script":"\r\n
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Why is work force times distance? a. linear motion b. curvilinear motion c. angular motion d. rectilinear motion e. rectivcurvi motion b. curvilinear motion If you could witness one event past, present, or future, what would it be? Rats, says your brother. Okay, you say, getting out your clipboard. 2023 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Because pressure is force divided by area, its meter-kilogram-second (MKS) units are newtons per square meter, or N/m2. That leaves only the final kinetic energy to calculate:\n![\"image13.png\"/](\"https://www.dummies.com/wp-content/uploads/331563.image13.png\")
Plugging in the numbers gives you:
\n![\"image14.png\"/](\"https://www.dummies.com/wp-content/uploads/331564.image14.png\")
So because
\n![\"image15.png\"/](\"https://www.dummies.com/wp-content/uploads/331565.image15.png\")
and the work done was
\n![\"image16.png\"/](\"https://www.dummies.com/wp-content/uploads/331566.image16.png\")
you get the following:
\n![\"image17.png\"/](\"https://www.dummies.com/wp-content/uploads/331567.image17.png\")
And, as before
\n![\"image18.png\"/](\"https://www.dummies.com/wp-content/uploads/331568.image18.png\")
Double rats, your brother says.
","description":"In physics, you can calculate power based on force and speed. He has authored Dummies titles including Physics For Dummies and Physics Essentials For Dummies. Dr. Holzner received his PhD at Cornell.
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