Ch. 2.pdf - Chapter 2 Kinematics-1D Position x(in meters...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 2 Kinematics-1D Position, x (in meters) changes with Time t (in seconds)
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Reference Frames Any measurement of position, distance, or speed must be made with respect to a reference. Will use + and signs to indicate positions in front or in back of the reference point Position-Time Graph ---- shows the motion of the particle (car)
Image of page 2
Distance and displacement Distance: the length of a path followed by a particle, always positive. Displacement: change in position during some time interval Δ x = x 2 – x 1 Can be positive and negative We make a distinction between distance and displacement.
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Average Velocity and Speed The average velocity is rate at which the displacement occurs The average speed = total distance / total time is a scalar quantity, always positive The SI unit of velocity and speed is m/s v average = Δ x Δ t = x f x i Δ t
Image of page 4
Simple practice What are the average velocity and speed in the first 40 s?
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Example The position versus time for a certain particle moving along the x axis is shown in Figure. Find the average velocity and speed in the time intervals (a) 0 to 2 s, (b) 0 to 4 s, and (c) 0 s to 8 s.
Image of page 6
A person walks first at a constant speed of 6.00 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 3.00 m/s. What is (a) her average velocity over the entire trip? (b) her average speed over the entire trip?
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Instantaneous Velocity The limit of the average velocity as the time interval becomes infinitesimally short, or as the time interval approaches zero.
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern