# Physics Unit 2

Flashcards by laurendavidson, updated more than 1 year ago
 Created by laurendavidson almost 6 years ago
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### Description

Physics Unit 2 in Mr. Lovell's class

## Resource summary

 Question Answer What are the two methods of adding and subtracting vectors? Tip to tail method and tail to tail method What does the tip to tail method look like? The tip to tail method connects the tip of one vector to the tail of another. What does the tail to tail method look like? The tail to tail method connects the tail of one vector to the tail of another. When do you use the tip to tail method? You only use the tip to tail method if the equation has more than two additives. Force A push or pull on an object, force requires physical contact except for forces produced by fields (gravitational. electric, and magnetic) What are forces modeled by? Forces are modeled by vectors. What is the magnitude of vector F? How hard the push or pull is on an object (newton or pounds) What is the direction of vector F? The direction of the push or pull What is the F of gravity? Weight What are kinematics? The study of motion, specifically excluding the causes of motion (forces) What are the 3 kinds of graphs used for kinematics? Position vs. Time Graph, Velocity vs. Time Graph, Acceleration vs. Time Graph What do all three graphs have in common? All three graphs represent history in time of motion of an object. Slope Rise over Run (Y/X) or average vertical axis variable over horizontal axis variable (Vav/Hav) What are the two kinds of slopes? Average and instantaneous slope Average Slope Average over a specific interval of time Instantaneous Slope Velocity at a specific instant of time What does speeding up on an x-t graph mean? The instant velocity is increasing, the slope of the tangent line becomes more steep as time flows What does slowing down on an x-t graph mean? The Instant velocity is decreasing, the slope of the tangent line is becoming less steep What does rest mean on an x-t graph mean? The slope of the tangent line is horizontal. What does moving right on an x-t graph mean? Positive direction, the slope is positive What does moving left on an x-t graph mean? Negative direction, the slope is negative What are the two types of graphs? Vector graphs and history graphs What does positive velocity on a v-t graph mean? Right, the velocity is positive What does negative velocity on a v-t graph mean? Left, the velocity is negative What does rest on a v-t graph mean? The velocity is equal to 0 What is time in physics? A stopwatch reading What does speeding up on a v-t graph mean? Upward constant acceleration, line going upward diagonally What does slowing down on a v-t graph mean? Downward constant deceleration, line going downward diagonally What does constant velocity on a v-t graph mean? The velocity is at a constant number, the line is horizontal Acceleration Change in velocity over elapsed time

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