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  • lbf means pounds-force
  • pound means pounds mass
  • kgf means kilograms-force
  • kg means kilograms mass
  • N means newtons
  • m means meters
  • s means seconds
  • ft means feet

We will compute the relationship between pounds-force and kilograms-force using the force unit of newtons an intermediary.

We will assume that the acceleration of gravity is either 32.17 ft/s^2 or 9.81 m/s^2.

The calculations are shown in Figure 4 .

Figure 4 . Relationship between pound-force and kilogram-force.
Begin with known conversion factors: 1 lbf = 1 pound * 32.17 * ft/s^21 pound = 0.45 * kg Substitute kg for pound.1 lbf = 0.45 * kg * 32.17 * ft/s^2 Substitute meters for feet.1 ft = 0.30 m 1 lbf = 0.45 * kg * 32.17 * 0.30 * m/s^2Do the arithmetic and substitute (1 N) for (1 kg*m/s^2)1 lbf = 4.34 * kg*m/s^2 = 4.34 N Now compute the relationship between kgf and NBegin with some more known quantities. 1 kgf = 1 kg * 9.81 * m/s^21 N = 1 kg*m/s^2 Substitute (1 N) for (1 kg * m/s^2)1 kgf = 9.81 N Now form a ratio between 1 lbf and 1 kgf1 lbf/1 kgf = (4.34 N)/(9.81 N) Cancel like terms, do the arithmetic, andmultiply both sides by kgf. 1 lbf = 0.44 kgf

Is this the correct answer?

According to the online units converter ,

1 pound-force (lbf) = 0.45359237 kilogram-force (kgf)

Considering that I rounded all computations to two decimal digits, my result is pretty close.

Apply conversion factor to the spring scale calibration

We now have a conversion factor that allows us to convert between lbf and kgf:

1 pound-force (lbf) = 0.45359237 kilogram-force (kgf)

If we multiply 20 lbf by0.45 to convert that value to force in units of kgf, we get 9.0 kgf. This agrees with the calibrations on my spring scale.

What do these terms really mean?

One lbf is the amount of force that is required to cause a one-pound mass to accelerate at 32.2 ft/s^2 due to the force of gravity.

One kgf is the amount of force required to cause a one-kg mass to accelerate at 9.81 m/s^2 due to the force of gravity.

Exercise involving a trapeze bar

Use your graph board to construct a picture that looks something like a very longtrapeze bar. By this, I mean a horizontal bar with a rope tied to each end. The other end of each rope is firmly attached to the ceiling. Make the horizontalbar ten meters in length.

Tactile graphics

The file named Phy1110b1.svg contains an image that represents this scenario. The image shows the trapeze bar, the ropes, and the spring scales. The imagealso shows vectors that represent the forces acting on the trapeze bar.

Figure 5 shows the mirror image that is contained in that file for the benefit of your assistant who will create the tactilegraphic for this exercise.

Figure 5 . Mirror image from the file named Phy1110b1.svg.
Missing image

Figure 6 shows a non-mirror-image version of the same image.

Figure 6 . Non-mirror-image version of the image from the file named Phy1110b1.svg.
Missing image

Figure 7 shows the key-value pairs that go with the image in the file named Phy1110b1.svg.

Figure 7 . Key-value pairs for the image in the file named Phy1110b1.svg.
m: Exercise involving a trapeze bar n: Ropeo: Rope p: Spring scaleq: Spring scale r: P = 8 Ns: Q = 2 N t: au: b v: Aw: C = 2 m x: By: 0 m z: Trapeze barmm: 10 m mn: W = 10 Nmo: File: Phy1110b1.svg

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
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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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