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# M3: force as a function of time watch

1. a bit of a ditsy question, as perusal but f = f(t)

so, thats force in terms of t, as opposed to lets say, f = ma?

basically, another way of finding force, but instead of ma, we're using time?
2. (Original post by Maths&physics)
a bit of a ditsy question, as perusal but f = f(t)

so, thats force in terms of t, as opposed to lets say, f = ma?

basically, another way of finding force, but instead of ma, we're using time?
They're not opposed to each other. It's not one or the other. F=ma is a law of newtonian mechanics. It's true always. Always. Writing F(t) = ...... is just a way to describe the force at different times.
If you're given time, you can plug that into the F(t) to find the force at that time.

These aren't the only two ways you can find the Force acting. You know many more. Using the fact that the system may be in equilibrium, and therefore resolving force to 0, resolving total moment to 0. Using Ft = change in p. etc. etc.
3. (Original post by StayWoke)
They're not opposed to each other. It's not one or the other. F=ma is a law of newtonian mechanics. It's true always. Always. Writing F(t) = ...... is just a way to describe the force at different times.
If you're given time, you can plug that into the F(t) to find the force at that time.

These aren't the only two ways you can find the Force acting. You know many more. Using the fact that the system may be in equilibrium, and therefore resolving force to 0, resolving total moment to 0. Using Ft = change in p. etc. etc.

Cool. That makes way more sense! Thank you!
4. (Original post by Maths&physics)
a bit of a ditsy question, as perusal but f = f(t)

so, thats force in terms of t, as opposed to lets say, f = ma?

basically, another way of finding force, but instead of ma, we're using time?
Well, most commonly so really, they're not so different since - both sides are functions of time.
5. (Original post by RDKGames)
Well, most commonly so really, they're not so different since - both sides are functions of time.
What is an expression of - what is it describing?

It’s like:
x = t^2 -2t could be an equation?
6. (Original post by Maths&physics)
What is an expression of - what is it describing?

It’s like:
x = t^2 -2t could be an equation?
is acceleration.

Not sure what you're talking about about with , it is an equation. is expressed in terms of time here therefore it is a function of time, ie
7. (Original post by RDKGames)
is acceleration.

Not sure what you're talking about about with , it is an equation. is expressed in terms of time here therefore it is a function of time, ie
so, is an example of

its just expressing x in terms of t?

would would the original example look like:
8. (Original post by Maths&physics)
so, is an example of

its just expressing x in terms of t?

would would the original example look like:
All you need to know about is that it just means is dependent only on the variable .
9. (Original post by RDKGames)
All you need to know about is that it just means is dependent only on the variable .
Thanks
10. (Original post by RDKGames)
All you need to know about is that it just means is dependent only on the variable .
one last thing. when , this is a variable force: as in the force changes depending on the moment in time?
11. (Original post by Maths&physics)
one last tung. when , this is a veritable farce, as in the force changes depending on the moment in time?
Yes this means the force* varies depending on time.
12. (Original post by RDKGames)
Yes this means the force* varies depending on time.
thanks.

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