ch2 - Motion in One-Dimension (Kinematics) Position /...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Motion in One Motion in One -Dimension (Kinematics) Dimension (Kinematics) Position / Displacement c Position is measured from an origin: b Joe is 10 feet to the right of the lamp b origin = lamp b direction = to the right b position vector 10 meters Joe O -x +x 10 meters Motion in One Dimension c Describes motion while ignoring the agents that caused the motion c In this chapter, we will consider motion in one dimension b Along a straight line c Will use the particle model b A particle is a point-like object, has mass but infinitesimal size
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Position Position c Defined in terms of a frame of reference b One dimensional, so generally the x- or y-axis c A particles position is the location of the particle with respect to a chosen reference point that we can consider to be the origin. Position -Time Graph Time Graph c The position-time graph shows the motion of the particle (car) c The smooth curve is a guess as to what happened between the data points
Background image of page 2
3 Displacement Displacement c Defined as the change in position during some time interval Δ x = x f x i (2.1) SI units are meters (m) Δ x can be positive or negative c Different than distance – the length of a path followed by a particle c Displacement is a vector quantity c Vector quantities need both magnitude (size or numerical value) and direction to completely describe them b Will use + and – signs to indicate vector directions Average Velocity c The average velocity is rate at which the displacement occurs c (2.2) c The dimensions are length / time [L/T] c The SI units are m/s c Is also the slope of the line in the position – time graph c Vector quantity f i average x x x v t t Δ = = Δ Δ
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 Average Speed Average speed = total distance / total time (2.3) c Speed is a scalar quantity b same units as velocity c The average speed is not (necessarily) the magnitude of the average velocity Example 2.1: Find the displacement, average velocity, and average speed of the car between position A & F Instantaneous Velocity Instantaneous Velocity c
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

ch2 - Motion in One-Dimension (Kinematics) Position /...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online