Physics I For Dummies by Cynthia Phillips;Shana Priwer; & Shana Priwer

Author:Cynthia Phillips;Shana Priwer; & Shana Priwer [Phillips, Cynthia & Priwer, Shana]
Language: eng
Format: epub
ISBN: 9781394367153
Publisher: John Wiley & Sons, Inc. (trade)
Published: 2025-12-23T00:00:00+00:00

where s is the distance traveled. However, the object’s speed, v, is just s divided by t, so the equation breaks down to:

That’s an interesting result — power equals force times speed? Yep, that’s what it says. However, because you often have to account for acceleration when you apply a force, you usually write the equation in terms of average power and average speed:

Here’s an example. Suppose your sibling got a snappy new car. You think it’s kind of small, but your sibling claims it has over 100 horsepower. “Okay,” you say. “Let’s put it to the test.”

Your sibling’s car has a mass of kilograms. 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. How much horsepower is that?

You know that , so all you need to calculate is the average speed and the net applied force. Take the net force first. You know that , so you can plug in the values to get:

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