Physics Help 1 FOR EXAM 1

# Physics Help 1 FOR EXAM 1 - Some general hints for solving...

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Some general hints for solving physics equations ALWAYS list your known variables and the unknown variable you are trying to solve. In the below equations, any of the variables could be the one you need to solve for but the most common uses are listed. 1) Δx = x f − x i = ½(v f + v i ) Δt => change in displacement = initial position – final position = ½ (final velocity + initial velocity)(change in time) This is the average velocity equation; it can also be used to find the change in time, particular velocity at a given time, or the initial/final positions. A car travels 50 m with an average velocity of 10 m/s. How long did it take the car to travel the 50 m? o ½(v f + v i ) = 10 m/s Δx = 50m Δt = ? o 50m = 10 m/s (Δt) => Δt = 5s 2) Δx = v i Δt + ½ a (Δt) 2 => change in displacement = initial velocity(change in time) + ½ (acceleration)(change in time squared) This equation is almost always used to find acceleration or displacement. Ex: A car at rest accelerates for 5s covering 30m. What was the cars acceleration? o v i = 0 m/s Δt = 5s Δx = 30m a = ? o

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## This note was uploaded on 12/23/2011 for the course PHYSICS 2130 taught by Professor Zhixianzhou, during the Fall '09 term at Wayne State University.

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Physics Help 1 FOR EXAM 1 - Some general hints for solving...

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