How to remember what v is in equations


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Sara_Lim_2C
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How to remember what v is in equations

Postby Sara_Lim_2C » Tue Oct 27, 2020 2:51 pm

Is there a good way to remember in which equations v=frequency versus when v=velocity? I keep getting them mixed up.

Faith St Amant 3D
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Re: How to remember what v is in equations

Postby Faith St Amant 3D » Tue Oct 27, 2020 2:58 pm

On our constants and equations sheet, the italicized v stands for the greek letter nu, which is the variable for frequency. The regular v stands for velocity. On that sheet specifically, c = λ v and E = hv are the only equations that use the greek letter nu (frequency). Hope this helps!

Minh-Thy Vo 3D
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Re: How to remember what v is in equations

Postby Minh-Thy Vo 3D » Tue Oct 27, 2020 3:00 pm

For my frequency v, I just make have a little tail in the beginning instead of being a straight v. So the fancy v is for frequency and the normal v is for velocity. Hope this helps!

OwenSumter_2F
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Re: How to remember what v is in equations

Postby OwenSumter_2F » Wed Oct 28, 2020 8:27 am

Also, in equations, velocity and frequency shouldn't be used together in the same step for what we're working on. For example, velocity should only be found working with kinetic energy of an electron or with momentum in the Heisenberg Uncertainty Principle, otherwise frequency will be used such as in the speed of light or energy of a photon.

Emma Ide 2E
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Re: How to remember what v is in equations

Postby Emma Ide 2E » Wed Oct 28, 2020 8:50 am

regular v is velocity, and the 'fancy' v is for frequency. when I write the v for the frequency I just make it have a tail at the beginning and end to try and make it stand out

Katie Le 3K
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Re: How to remember what v is in equations

Postby Katie Le 3K » Wed Oct 28, 2020 11:25 am

On our formula sheet, if you look closely, the italicized v is frequency and the normal v is velocity.

Emmeline Phu 1G
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Re: How to remember what v is in equations

Postby Emmeline Phu 1G » Wed Oct 28, 2020 11:47 am

Hi! On the formula sheet, velocity is written as a normal v whereas frequency is written as an italicized v. However, it best to know which equations involve velocity or frequency for a better understanding of the material. For example, KE involves velocity, not frequency and the Bohr frequency condition involves frequency, not velocity. Hope this helps! :)

Ava Nickman
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Re: How to remember what v is in equations

Postby Ava Nickman » Wed Oct 28, 2020 1:09 pm

Yes, the font is different depending on if it stands for frequency or velocity. But also understanding what each equation means will help. Ex. Typically if wavelength is involved, they are referring to v as frequency. versus if mass is involved they are probably using velocity.

Megan ODonnell 3F
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Re: How to remember what v is in equations

Postby Megan ODonnell 3F » Fri Oct 30, 2020 5:49 pm

v with italics is frequency whereas v non-italics is speed.

AndrewNguyen_2H
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Re: How to remember what v is in equations

Postby AndrewNguyen_2H » Fri Oct 30, 2020 5:54 pm

A 100% sure-fire way to ensure that you aren't mixing the units up is by actually canceling out the units and making sure that both sides of the equation are equal. Velocity is m/s while frequency is only /s. Another way to intuitively gauge it is, when the particle in question has a mass it's usually velocity.

SophiaJenny3I
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Re: How to remember what v is in equations

Postby SophiaJenny3I » Fri Oct 30, 2020 6:48 pm

Hi! First, what everyone said about the different font is a great way to check! In case you want to double check, I always cancel out my units to make sure. If the units of velocity or frequency don't match the other variables or constants in the equation, you know you have the wrong one!

Colin Squire 3B
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Re: How to remember what v is in equations

Postby Colin Squire 3B » Fri Oct 30, 2020 7:05 pm

The v in the equation E=hv is actually the Greek letter nu. In the equation sheet it seems like it is slightly italicized so that might be one thing to look out for. For velocity, it is just the regular letter v.

AmyHo2K
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Re: How to remember what v is in equations

Postby AmyHo2K » Fri Oct 30, 2020 9:46 pm

For my notes I write cursive v for frequency and normal v for velocity. The equation sheet does a similar thing where v for frequency is italicized.

Brenda Silva 1B
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Re: How to remember what v is in equations

Postby Brenda Silva 1B » Fri Oct 30, 2020 10:10 pm

In most cases, the v that is italicized would be the frequency and the normal v would be velocity but it is best to look at the units being used.

David Facio 1K
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Re: How to remember what v is in equations

Postby David Facio 1K » Fri Oct 30, 2020 11:23 pm

My TA recommended since Week 1 that we differentiate our variables with specific font. You may choose to exaggerate your "v" for frequency by writing it in cursive or even write it like the zodiac symbol for aries. Whatever helps you visually remind yourself NOT to mix it up with the regular font "v" for velocity. Hope this helps!

cadytran1K
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Re: How to remember what v is in equations

Postby cadytran1K » Fri Oct 30, 2020 11:47 pm

When I refer to velocity, I know that it is the standard, "v" but when I'm doing an equation that involves frequency, I know that the font for "v" is different.

YUNALEE
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Re: How to remember what v is in equations

Postby YUNALEE » Sat Oct 31, 2020 11:58 am

if it is talking about physics like kinetic energy and has variables like mass, you know that it's velocity. If it gives you factors like wavelength, it's frequency.

Brianna Chen 3F
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Re: How to remember what v is in equations

Postby Brianna Chen 3F » Sat Oct 31, 2020 11:26 pm

In most cases, velocity deals with a matter that has mass (electrons, neutrons, etc.) whereas frequency deals with wave-like properties, typically found in light. In addition, it is important to keep in mind the conceptual idea behind each equation which will help you understand which equations contain velocity versus frequency.

Sukhkiran Kaur 3I
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Re: How to remember what v is in equations

Postby Sukhkiran Kaur 3I » Sun Nov 01, 2020 1:32 pm

I was confused by this too, but a regular v usually means velocity while an italicized v means frequency.

Isabella Cortes 2H
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Re: How to remember what v is in equations

Postby Isabella Cortes 2H » Sun Nov 01, 2020 1:42 pm

Hi! On our equation sheets "v" for frequency is italicized and "v" for velocity is not. One way that helps me remember is to look at the context of the problem, for example if you are dealing with kinectic energy or momentum, then "v" will be velocity. I hope this helps!!

Tatyana Bonnet 2H
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Re: How to remember what v is in equations

Postby Tatyana Bonnet 2H » Sun Nov 01, 2020 2:17 pm

E=hv and[ C=lamba x v ]is relating to energy and wave properties of light, so v in the different font would be frequency. In de Brogiles equation and kinetic energy equation they deal with speed/motion of particles in some way so v would symbolize velocity.

Ryan_Page_1J
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Re: How to remember what v is in equations

Postby Ryan_Page_1J » Sun Nov 01, 2020 2:23 pm

A normal v is velocity and an italicized v is frequency

Sreeram Kurada 3H
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Re: How to remember what v is in equations

Postby Sreeram Kurada 3H » Sun Nov 01, 2020 2:24 pm

Depending on the equation I am using, I would try to make sense of how that equation was derived. This then would clarify whether v is frequency or velocity. For example, de Broglie's equation is based on the momentum of the electron so I would think of that v as velocity, while in the speed of light equation and the energy equation I would think of waves of light where the v is frequency. But like others were saying on this post the italicized v is typically frequency and the regular v is typically velocity.

Reese_Gover2K
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Re: How to remember what v is in equations

Postby Reese_Gover2K » Sun Nov 01, 2020 2:49 pm

The best way is to look at how they are written velocity is a regular v and for frequency it is a swoopy kinda cursive like v which is the greek letter nu.

Armen_Isayan_2L
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Re: How to remember what v is in equations

Postby Armen_Isayan_2L » Sun Nov 01, 2020 3:59 pm

Use a regular v for velocity. As for the frequency v, I just add a small tail in the beginning and that should help you differentiate between your frequency and velocity v's.

DPatel_2L
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Re: How to remember what v is in equations

Postby DPatel_2L » Sun Nov 01, 2020 4:18 pm

On the formula sheet, the italicized one is the frequency.

Arnav Saud 2C
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Re: How to remember what v is in equations

Postby Arnav Saud 2C » Sun Nov 01, 2020 5:02 pm

On the formula sheet, the frequency notation is italicized while velocity is not. When doing your calculations, make sure you correctly write an italicized v when using frequency and a normal v when doing velocity so as to avoid confusion.

LarisaAssadourian2K
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Re: How to remember what v is in equations

Postby LarisaAssadourian2K » Sun Nov 01, 2020 5:19 pm

On the formula sheet, E=hv and c=λv are the only formulas that have the curved v (otherwise known as nu) in them. If you look closely, every other v looks normal, indicating that they symbolize velocity.

Ava_Basileo_2J
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Re: How to remember what v is in equations

Postby Ava_Basileo_2J » Sun Nov 01, 2020 5:26 pm

I try to remember that the "v" that represents frequency is not actually a v. It is really the Greek letter nu. As such, I draw it differently than a regular "v" by making it more slanted and curly.

Pranav Daggubati 3C
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Re: How to remember what v is in equations

Postby Pranav Daggubati 3C » Sun Nov 01, 2020 5:30 pm

Frequency is denoted by nu, which looks like , whereas velocity is denoted by the English alphabet 'v'

Violet Kwan 3H
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Re: How to remember what v is in equations

Postby Violet Kwan 3H » Sun Nov 01, 2020 5:32 pm

When I am writing equations or using a variable with frequency and velocity, I try to put a mark/tail in front of v for frequency. On the formula sheet, the italicized one is for frequency, and the normal v is for velocity. Also, it would probably be helpful to go over the formula sheet and try to memorize which one is needed for each formula, so you don't need to decipher each time.

simona_krasnegor_1C
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Re: How to remember what v is in equations

Postby simona_krasnegor_1C » Sun Nov 01, 2020 6:20 pm

In my head, I just think that the "fancy" v is for frequency because they both start with an f. Hope this helps!

LovepreetSran_3H
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Re: How to remember what v is in equations

Postby LovepreetSran_3H » Sun Nov 01, 2020 6:33 pm

The italicized v is for frequency, whereas the normal v is for velocity.

Dane_Beasley_1E
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Re: How to remember what v is in equations

Postby Dane_Beasley_1E » Sun Nov 01, 2020 9:20 pm

The italicized v is actually the Greek letter nu and is used for frequency. When working with velocity it is just a regular v.

Jack Kettering 3D
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Re: How to remember what v is in equations

Postby Jack Kettering 3D » Sun Nov 01, 2020 9:27 pm

It is very confusing I agree but if you look closely on the lecture slides as well as the formula sheet we are given the v for frequency is actually italicized and represents a Greek letter whereas the normal English v refers to velocity

Madeline Marron 1I
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Re: How to remember what v is in equations

Postby Madeline Marron 1I » Sun Nov 01, 2020 9:34 pm

When i write them down I deliberately make v=frequency as like a cursive looking one and the velocity in my own handwriting. The best way to know is on the equation sheet is just to remember which equation uses which. Most of the time it will be for frequency, unless you're calculating momentum.

305572629
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Re: How to remember what v is in equations

Postby 305572629 » Sun Nov 01, 2020 9:41 pm

Tip: if something says Hertz or cycles per second, it is talking about frequency. Velocity is also a regular lowercase v and frequency is a cursive-looking v in equations.

Jenaye Brelland 2I
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Re: How to remember what v is in equations

Postby Jenaye Brelland 2I » Sun Nov 01, 2020 9:51 pm

I slightly curve or round my v for frequency and maintain the v shape for velocity. Sometimes it can still be confusing so others add a hook on the end of frequency.

Nick P 3D
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Re: How to remember what v is in equations

Postby Nick P 3D » Sun Nov 01, 2020 9:52 pm

the v for frequency should always be italicized while v for velocity is not

Ivan Chen 2H
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Re: How to remember what v is in equations

Postby Ivan Chen 2H » Sun Nov 01, 2020 9:55 pm

velocity is a lowercase v, while frequency is curved. I think it helps that in most of the equations so far, v (for velocity) deals with the movement of electrons, and v (for frequency) deals with light

Algernon Jackson 2l
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Re: How to remember what v is in equations

Postby Algernon Jackson 2l » Sun Nov 01, 2020 9:55 pm

The v for frequency is italicized, that's how I remember it.

Constance Newell
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Re: How to remember what v is in equations

Postby Constance Newell » Sun Nov 01, 2020 10:01 pm

one v will be cursive and another will not

Yolanda_Xing_3A
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Re: How to remember what v is in equations

Postby Yolanda_Xing_3A » Sun Nov 01, 2020 10:54 pm

The italicized v is the frequency while non italicized is velocity.

Callan Howard
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Re: How to remember what v is in equations

Postby Callan Howard » Sun Nov 01, 2020 11:13 pm

one thing that helps me is that if I notice a v with an m (ex: abc + mv) the v is for velocity and is not a greek letter nu for frequency

lauren_tran_1L
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Re: How to remember what v is in equations

Postby lauren_tran_1L » Sun Nov 01, 2020 11:14 pm

Use the equation sheet!

Teti Omilana 1G
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Re: How to remember what v is in equations

Postby Teti Omilana 1G » Sun Nov 01, 2020 11:16 pm

Like everyone has been saying, the v for frequency is written in cursive and for velocity it is not. If you forget that you can always look at your units: frequency (hz), velocity (m/s).

Anastasia Yulo 1C
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Re: How to remember what v is in equations

Postby Anastasia Yulo 1C » Sun Nov 08, 2020 11:30 am

Typically nu denotes frequency, which looks like an italicized v. A diligent way to confirm whether or not it is velocity or frequency is to check the units! Velocity is in m/s whereas frequency is in Hz. Typically the speed of light is denoted with "c"


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