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Tactile graphics

The velocity values shown in Figure 6 are plotted in the image that is contained in the file named Phy1080b1.svg, along with theheight values and the acceleration values.

Analysis of the results

The difference between Figure 4 and Figure 6 is the addition of a column of velocity information on the right in Figure 6 . As you can see, the velocity begins with a positive value of 100 feet/second at the top of thevelocity column.

The velocity goes to zero somewhere between 3 and 3.25 seconds, which is the point where the height of the arrow reaches its maximum.

At 3.25 seconds, the velocity switches from positive to negative meaning that the arrow begins falling back toward the earth. The velocity reaches-100 feet/second somewhere between 6.25 and 6.5 seconds, which is about the same time that the arrow hits the ground.

Plot the velocity curve

I believe you might find it useful to plot the velocity curve on the graph board without removing the height curve if you can. That will give you a goodopportunity to use your hands to "see" the big picture insofar as the relationship between the height (displacement) and the velocity are concerned.

When you do that, hopefully you will recognize that the velocity curve for this particular situation is a straight line with a negative slope. Thatstraight line crosses the horizontal axis going from positive territory into negative territory about half way between the original release of the arrow andthe point where the arrow strikes the ground.

Analysis of the code

A comparison of Listing 2 with Listing 1 shows the addition of the following variables:

  • var oldT = 0; //previous time in seconds
  • var delT = 0; //change in time in seconds
  • var oldH = h0; //previous height in feet
  • var delH = 0; //change in height in feet

Save values for use in next iteration

As you will see when I get into an explanation of the while loop, the variables oldT and oldH are used to save the time value and the height value during each iterationto make those values available during the next iteration.

Compute changes in time and height

Inside the while loop, the current value of t and the value stored in oldT are used to compute the change in time since the previous iteration. The current value of h and the value stored in oldH are used to compute the change in height since the previous iteration. These change values are saved in the variables named delT and delH .

Velocity is the ratio of the changes

In this case, the value in delH represents the displacement of the arrow during the time interval and the value stored in delT represents the length of the time interval. As you already know, the velocity isthe ratio of those two values. The value for velocity is computed along with the time and the height and then the script executes the next iteration of the while loop.

The while loop

The while loop in Listing 2 begins the same as in Listing 1 . After the new height value is computed, the script performs the computationsdescribed above to estimate and display the velocity for the time interval since the previous iteration.

Questions & Answers

I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
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Source:  OpenStax, Accessible physics concepts for blind students. OpenStax CNX. Oct 02, 2015 Download for free at https://legacy.cnx.org/content/col11294/1.36
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