By Dale D. Long
ISBN-10: 0534086705
ISBN-13: 9780534086701
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Extra resources for The Physics Around You
Example text
That equation must exist between these two equations. law of gravitation, pulling m-\ out in front and grouping relationship Let's recast the the other quantities together: 1/V = 200N = 1/4 F = m We We can H] now {/0 — evaluate the quantity in brackets, taking the earth and d as the distance its radius. The of d. we quantity [G point, not just at distances of one, two, three, four, and five times the radius of the earth. We is the astronaut's weight on earth— 800 N. 8 m/s just we do when using , the value W= same m 2 /d 2 gives the acceleration due to gravity at any on the ] surface A results as of the earth, why g is if you use mg.
Moon earth anywhere else) as The weight on the only 8 that on (b) is (a). The mass of an same on the chair. The up on your body. You can be sure of this because, if the chair were not there, you would fall to the floor. The force with which the chair pushes on you is exactly equal to the force with which you push on the chair. The force from the chair, however, is applied in the opposite direction of the force from your body (Fig. 6). When you hit a tennis ball with a racket, the racket exerts a force on the ball.
But just how much does it move, or how fast, as related to how hard you push or pull? Or does it even move at all? ) As we find the answer physics that we more precise meaning for force between force and motion. We call the laws that relate force and motion Newton's laws of motion. To understand these laws, we will need to define the terms used to describe motion. We will also encounter the concept of mass. Newton's laws of motion are basic to all of physics because they tell us how matter reacts to any force, whatever the origin of that force.
The Physics Around You by Dale D. Long
by David
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