tailieunhanh - SAT II Physics (Gary Graff) Episode 1 Part 3

Tham khảo tài liệu 'sat ii physics (gary graff) episode 1 part 3', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 1 PRELIMINARY CONCEPTS CHAPTER 1 PRELIMINARY CONCEPTS SIMPLE EQUATIONS AND ALGEBRA Physics is the branch of science that studies physical phenomena. Why does the sound of a starter s pistol reach an observer standing at the race finish line after the puff of smoke is seen when the gun is fired Why do some objects float in water while other objects sink What causes a ball to roll downhill These questions and more are the stuff of physics. Sometimes the study of physical phenomena involves observation experimentation and calculation. The calculations used in this review are accomplished by using a little algebra a little geometry and a little trigonometry. Many relationships in physics can be expressed as equations. For example F ma s vt Sometimes the value to be found is not by itself isolated in the equation. Take for example the linear motion equation Vf 2 Vo 2 2as Let s suppose the acceleration a is the only unknown quantity in the equation. We must perform a little algebraic manipulation to isolate a so that it is the only quantity on its side of the equal sign. Before starting the process remember one simple rule whatever operation you perform on one side of the equal sign you must also perform on the other side of the equal sign. Let s begin by isolating a in the equation below Vf 2 Vo 2 2as We then subtract Vo2 from both sides 2 2 2 2 Vf -Vo Vo -Vo 2as Peterson s . .

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