If you related the position of the runner to the background in each frame taken in 1 second intervals you would conclude that the student is in motion This series of images taken at regular intervals creates a motion diagram for the change in the students state of motion ID: 643924
Download Presentation The PPT/PDF document "Picturing Motion: Dot Diagrams" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Picturing Motion: Dot Diagrams
If you related the position of the runner to the background in each frame taken in 1 second intervals, you would conclude that the student is in motion.This series of images, taken at regular intervals, creates a motion diagram for the change in the student’s state of motion.Slide2
Roll a ball along a
horizontal surface, and its velocity is constant because no component of gravitational force acts horizontallyDrop it, and it accelerates downward and covers greater vertical distances each second.Slide3
Freefall
The rate at which the velocity changes each second is the same whether the ball is going upward or downward.+
- Slide4
By noting the
distance the object moves in equal time intervals, you can determine the object’s state of motion A: at restB: moving at a constant speedC: speeding upD: slowing down.Slide5
Use a dot motion diagram model to draw simplified motion diagrams
A: at restB: moving at a constant speedC: speeding upD: slowing down.Slide6
Use the dot diagram model to draw a motion diagram for an object moving at a
constant speed.Use the dot diagram model to draw a motion diagram for an object starting at rest and speeding up.Use the dot diagram model to draw a motion diagram for an object that starts from rest, speeds up to a constant speed, and then slows to a stop.Slide7
Use the dot diagram model to draw a motion diagram for a wheel turning at a constant speed. First place the dot at the hub of the wheel. What would the diagram look like if the dot were placed on the rim of the wheel?Slide8
Dot Diagrams & Vector Quantities
To determine displacement, velocity, and acceleration, a coordinate system must be specified.Normally the positive values of x extend horizontally to the right, and the positive values of y extend vertically upward.Slide9
The sign of the average velocity depends upon the chosen coordinate system. The coordinate systems in a and b are equally correctSlide10
Color Conventions
Displacement vectors are green.Velocity vectors are red.Accelerations vectors are violetSlide11
Graphs and motion diagrams are useful in differentiating
constant motion and motion that is accelerated.A speed-versus-time graphA distance-versus-time graphSlide12Slide13
The
sign of the acceleration depends upon the chosen coordinate system.Ex: a ball being rolled up an inclined drivewaySlide14
Refer to the motion graph below to find
The time interval(s) for positive accelerationThe time interval(s) for negative accelerationThe time interval(s) for constant velocityThe time interval(s) for zero accelerationAt what time(s) does the car appear to be at rest?At what time(s) does the car turn around and move in the opposite direction?