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University of Michigan - Ann Arbor
Simon Fraser University
(I) A 7150-kg railroad car travels alone on a level frictionless track with a constant speed of 15.0 m/s. A 3350-kg load, initially at rest, is dropped onto the car. What will be the car's new speed?
Suman Saurav T.
(II) According to a simplified model of a mammalian heart, at each pulse approximately 20 $g$ of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle?
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continuing from our last example video. What do we do once we have a work say, In the last example video, we found that we did 24 jewels of work, taking an object from Vienna equal to one meter per second to the final equal to 5 m per second. What does it mean, though? Well, we know that work is also equal to force times distance comes cosine of the angle between them. Let's just assume that force and displacement here are in the same direction. So we have F. Delta X is equal to 24 jewels now by simply knowing a change in velocity and a change of displacement, both of which are very easy measurements to take. We can come up with the force applied to the object, which is generally speaking a little bit more difficult to come across. There are a number of different ways we have for measuring forces. For example, you may come across some in your lab that look like little glass tubes with springs and them and hooks on the bottom, and you can hang a mass and it will stretch the spring out and there will be little markings on the side that will tell you how many Newtons you're applying. Um, so that's one way and that you'll use in the lab and a lot of more sophisticated ways actually use more or less the same technology where you're either compressing or pulling on spy brings that have been calibrated. And then, inside there's someone electron ICS that measure it now it's not always going to be a spring. In fact, often instead be something called P so electric, where which is essentially a component of material that you can generate a voltage by compressing it or pulling on it s o. Keizo Electrics are generally what's used for that, but it's the same principle were compressing or pulling on it, and it generates a voltage in the voltage is calibrated to say this is one Newton's to Newton's three Newton's. Either way, these may not be tools that you have in your toolbox, but you probably have a tape measure and a stopwatch, which is literally all that you need to calculate all of these things. In fact, you can even find, uh, initial and final velocities from a lot of the simple tools we used in kidney Matics. So being able to use those very simple measurements to come up with a nontrivial measurement of force notice the unit's air correct as well. We have Newton meters is what jewels are divided by meters to this results in Newton's. This is a very, very helpful thing to do, and it helps with all sorts of analyses to be able to find a force quickly simply by measuring velocity and displacement.
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