PPT-Position, Velocity, Acceleration

Significant Figures Measurements Errors Vectors Relative Motion Studying Tips Equilibrium and Nonequilibrium Problems Circular Motion Centripetal Force 1 PHY131 1 st half Exam Jam Jason Harlow. Section 3.4a. The difference quotient:. When we let . h. approach 0, we saw the rate at which a function. w. as changing at a particular point . x. …. Definition: Instantaneous Rate of Change. The . Section 3.4a. The difference quotient:. When we let . h. approach 0, we saw the rate at which a function. w. as changing at a particular point . x. …. Definition: Instantaneous Rate of Change. The . Kinematics:. Velocity, Speed, and Rates of Change. Greg Kelly, Hanford High School, Richland, Washington. Rectilinear Motion. Motion on a line. Suppose a dog moves along a straight line so that its position . What Is Motion?. Motion. is when an object changes place or position. To properly describe motion, you need to use the following:. Start and end position?. Movement relative to what?. How far did it go?. Unit 9.2. m/s. 2. average acceleration. a = . D. v. D. t. 50 m/s – 25m/s. 4s – 2s. = . = . 12.5 m/s. 2. B. C. A. A. C. none. B. n. f. –. . n. i. t. f. –. . t. i. Practice. : A pool ball travelling at 2.5 m/s towards the cushion bounces off at 1.5 m/s. If the ball was in contact with the cushion for 0.20 s, what is the ball’s acceleration? (Assume towards the cushion is the positive direction.). PHYS 243. Giancoli. , Sec 2-1, 2, 3, 4. © . 2011, . B.J. . Lieb. Analysis of a Race. All distances measured from starting line.. Time measured by a stopwatch from sound of gun.. Initial speed will be zero. . Mr. Fedell. VT vs. PT graphs. A position-time (PT) graph tells you . where an object is.. A velocity-time graph tells you . how fast it’s moving.. **(VT graphs DO NOT give in position info!)**. When an object stays still for 10s, its velocity is . . trajectory, vectors. . r, v, a, F. j. ,… . ,. coordinate axes x, y, z, free-body diagram, … . 2. Data:. . a table of known and unknown quantities, . including “implied data”.. 3. Equations . Velocity and acceleration Measuring an objects motion speed Speed is calculated by dividing distance by time S = d/t 5.0 km/h 2.5 m/s 45 mph velocity Velocity is the same as speed, but you tell the direction of motion in the answer. Acceleration is a change in velocity. Speed or direction. Centripetal Acceleration. Acceleration can mean a change in direction, not just speed. Centripetal acceleration. Acceleration that occurs in a circular motion. V. ector quantity: . magnitude (value) & direction. R. ate . at which an object changes its velocity. . “. How fast an object is getting faster”. If the velocity of an object is changing, it is accelerating!. Displacement: . Is the distance from where you start to where you finish. . Δ. d=. d. f. -d. i. Velocity:. How fast and in what direction (vector quantity). V = ∆d/t. Speed: . How fast (scalar quantity). What is acceleration?. If you’re traveling in a car at a constant speed of 50 mph, are you accelerating?. No, you’re not. . Acceleration is the rate of change of velocity. . Acceleration. In order for acceleration to occur, velocity MUST be . Lesson . 2. Position with Constant Acceleration. The graph shows that the car’s motion is not uniform: The displacements for equal time intervals on the graph get larger and larger.. The slope of a position-time graph of a car moving with a constant acceleration gets steeper as time goes on..