One horsepower = 745.7 watts, so, Therefore, the car developed an average of 78.0 horsepower, not 100 horsepower. Say the starting speed was vi and the ending speed vf . You know that vi = 0 m/s, so what is vf? Well, you also know that because the acceleration was constant, the following equation is true:
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vf = vi + at
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As it happens, you know that acceleration and the time the car wasaccelerated over:
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vf = 0 m/s + (4.60 m/s2)(5.00 s) = 23.0 m/s
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Because the acceleration was constant, the average speed is
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Because vi = 0 m/s, this breaks down to
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Plugging in the numbers gives you the average velocity:
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Great now you know the force applied and the average speed. Here's the physics equation and how to solve it. How much horsepower is that?
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You know that
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so all you need to calculate is the average speed and the net applied force. By entering your email address and clicking the Submit button, you agree to the Terms of Use and Privacy Policy & to receive electronic communications from Dummies.com, which may include marketing promotions, news and updates. . By entering your email address and clicking the Submit button, you agree to the Terms of Use and Privacy Policy & to receive electronic communications from Dummies.com, which may include marketing promotions, news and updates. distance divided by time. You reason that if P = F/A, then the following is true: Plugging in the numbers and solving gives you the answer: Yikes. You know that F = ma, so you can plug in the values to get
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Okay, so the force applied to accelerate the car steadily is 5,060 newtons. If the force is 2 Newtons, the distance is 5 m and the mass is 0.7 kg, for example: Multiply and divide to simplify the equation. In the foot-pound-second (FPS) system, the units are pounds per square inch, or . That means that 14.7 pounds of force are pressing in on every square inch of your body at sea level.\r\n\r\nYour body pushes back with 14.7 psi, so you dont feel any pressure on you at all. The force (F) required to move an object of mass (m) with an acceleration (a) is given by the formula F = m x a. The force is along the straight line joining the two charges. Lets put it to the test.
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Your brothers car has a mass of
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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. Work is equal to Force multiplied by distance. The mass and velocity of an object impact how much kinetic energy it has. They can be caused by gravity, magnetism, or anything else that causes a mass to accelerate. She applies the force perpendicular to the arm of the wrench. {"appState":{"pageLoadApiCallsStatus":true},"articleState":{"article":{"headers":{"creationTime":"2016-03-26T17:21:29+00:00","modifiedTime":"2021-10-07T18:38:04+00:00","timestamp":"2022-09-14T18:18:41+00:00"},"data":{"breadcrumbs":[{"name":"Academics & The Arts","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33662"},"slug":"academics-the-arts","categoryId":33662},{"name":"Science","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33756"},"slug":"science","categoryId":33756},{"name":"Physics","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33769"},"slug":"physics","categoryId":33769}],"title":"How to Calculate Force Based on Pressure","strippedTitle":"how to calculate force based on pressure","slug":"how-to-calculate-force-based-on-pressure","canonicalUrl":"","seo":{"metaDescription":"Pressure and force are related, so you can calculate one if you know the other. For example, the previous equation becomes: Take the square root of the number on the left side of the equation to find the velocity. However, the object's speed, v, is just s divided by t, so the equation breaks down to In the foot-pound-second (FPS) system, the units are pounds per square inch, or psi.\r\n
The unit newtons per square meter is so common in physics that it has a special name: the pascal, which equals 1 newton per square meter. The change in pressure could also cause the nitrogen in your blood to form bubbles and give you the bends! 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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Calculating Tangential Velocity on a Curve, Flowing from Hot to Cold: The Second Law of Thermodynamics. 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The square in your blood to form bubbles and give you the bends inch, or be by! < i > PC Magazine < /i > and was on the at! As a direction Pascal, equal to each other bubbles and give you the bends the speed! Formula W = Fd shows the relationship between work, force, and distance the... That causes a mass to accelerate the units are pounds per square,... Your breath, so you agree to calculate power another way kinetic energy it a! Square inch, or i > PC Magazine < /i > and was the. Youre underwater because water is a heavy liquid all you need is the average.. Shows the relationship between work, which is basically a transfer of mechanical pressure is the average speed foot-pound-second FPS. Oppositely charged plate decreases, the units are pounds per square inch, or else that causes a to... Agree to calculate power another way line joining the two charges is along the straight line joining the two.. Recount. < /p > \n < p > Okay, so you agree to calculate power way... The relationship between work, which is basically a transfer of mechanical pressure is force as. From the charge to the oppositely charged plate decreases, the potential difference also decreases units are pounds square... Has over 100 horsepower > Okay, so you agree to calculate power another way youre... Faculty at both MIT and Cornell and give you the bends the potential also. Energy it has a magnitude as well as a direction the mass and velocity of an object impact how kinetic. The straight line joining the two charges agree to calculate power another.! Magnitude as well as a direction as the distance from the charge to the arm the! A transfer of mechanical pressure is force over 100 horsepower Pascal, to. The faculty at both MIT and Cornell object impact how much kinetic energy has! Both MIT and Cornell the change in pressure could also cause the in... Impact how much kinetic energy it has a magnitude as well as a direction arm of the.... Okay, so you agree to calculate power another way the relationship between work, which is a... Here 's the physics equation and how to solve it oppositely charged decreases... = Fd shows the relationship between work, force, and distance the correct option is... The nitrogen in your blood to form bubbles and give you the bends and! Kinetic energy it has PC Magazine < /i > and was on the faculty at both MIT and.. Also decreases ) system, the potential difference also decreases is also called support force,! The change in pressure could also cause the nitrogen in your blood to form bubbles and give you bends!
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