By Dale D. Long
ISBN-10: 0534086705
ISBN-13: 9780534086701
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Additional info for The Physics Around You
Sample text
For example, could you throw the ball any faster? In Why is a person with a weak heart likely to feel dizzy while accelerating upward Why shot-put with the same you throw speed you can throw Why even though ball, are football linemen usually heavier than backs? Is it their weight or their mass 12. that In terms is explain important? a in a softball? it's bigger? of Newton's second law of motion, why inflatable airbags protect the pas- sengers of an automobile during 5. If a pinball gets stuck, ball machine in the way you want why do you hit the pin- opposite direction from the 13.
0 s. 9 The and distances shown of velocities fall are a at various times after the rock is dropped. 7 Falling Bodies EXERCISE If were no jumping? ) tear a page from the book, hold the page horizontally and drop it, it would drift down slowly. If you wad the page up, it would fall somewhat faster. The three fall times differ because of air resistance. The acceleration depends on the net force, and these objects are not falling freely under the action of their weight only. The air resistance gives a force in the g.
_ change Acceleration change Newton's in v may involve When you change speed, in use any equation that states tion or a physical law, must be expressed Newton's a a or both. in direction, a defini- quantities in the equation all same system of units. law of motion: A body at rest acted on by a net outside force; in the first stays at rest unless motion in a straight line with constant speed unless acted on by a net outside a body in motion W= mg stays in force. where g is the acceleration of an object in free near the earth.