Wednesday, August 26, 2015

EJSS Free Fall Kinematics in Y direction Model

Kinematics in Y direction

Free Fall showing blue no air resistance, yellow small air resistance, teal large air resistance in the displacement versus time plot
http://weelookang.blogspot.sg/2015/08/ejss-free-fall-kinematics-in-y.html
run: Link1Link2
download: Link1, Link2
source: Link1Link2
author: lookang 
author EJS: Francisco Esquembre

Free Fall showing blue no air resistanceyellow small air resistance, teal large air resistance in the velocity versus time plot
run: Link1Link2
download: Link1Link2
source: Link1Link2
author: lookang 
author EJS: Francisco Esquembre

Free Fall showing blue no air resistanceyellow small air resistance, teal large air resistance in the acceleration versus time plot
run: Link1Link2
download: Link1Link2
source: Link1Link2
author: lookang 
author EJS: Francisco Esquembre



 

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Topics

Kinematics
Speed, velocity and acceleration
Graphical analysis of motion
Free-fall
Effect of air resistance

Description

This simulation has a drop-down menu for exploration of
(i) at rest  use of progressive mathematical model is encouraged Y = 0 for example
(ii) moving with uniform velocity, use of progressive mathematical model is encouraged
(iii) moving with non-uniform velocity (eg, constant acceleration) use of progressive mathematical model is encouraged
When only the  velocity-time graph check-box is selected, it can be explored for the following cases too.
(i) at rest 
(ii) moving with uniform velocity (eg, no acceleration) model of the form Y = Y0+u*t 
(iii) moving with uniform acceleration (eg, constant acceleration = 9.81 m/s^2) model of the form Y = Y0+u*t+0.5*g*t 
(iv) moving with non-uniform acceleration (eg, with small ot large drag force acting thus acceleration changes).
The default acceleration is set at-9.81 m/s^2 which is near to the Earth is constant and is approximately 10 m/s 2.
Lastly, by  selecting the 3 options of
"free fall"
"free_fall_with_small_air_resistance"
"free_fall_with_large_air_resistance"
It can provide the experience and evidences for describing the motion of bodies with constant weight falling with (large and small) or without air resistance, including reference to terminal velocity, a constant velocity as a result of balanced forces of weight of mass and the drag force giving rise to zero acceleration.

Sample Learning Goals

(e) plot and interpret a displacement-time graph and a velocity-time graph
(f) deduce from the shape of a displacement-time graph when a body is:
(i) at rest 
(ii) moving with uniform velocity
(iii) moving with non-uniform velocity
(g) deduce from the shape of a velocity-time graph when a body is:
(i) at rest 
(ii) moving with uniform velocity
(iii) moving with uniform acceleration
(iv) moving with non-uniform acceleration
(i) state that the acceleration of free fall for a body near to the Earth is constant and is approximately 10 m/s 2
(j) describe the motion of bodies with constant weight falling with or without air resistance, including reference to terminal velocity

Version:

  1. http://weelookang.blogspot.sg/2015/08/ejss-free-fall-kinematics-in-y.html
  2. http://weelookang.blogspot.sg/2013/12/ejss-free-fall-model.html