To find time

  • Thread starter Serj
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I want to know how to find the time it takes for a mass to reach a velocity if a force is applied to it.
 
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  • #2
Doc Al
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One way is to apply Newton's 2nd law to find the acceleration, then integrate--or apply kinematic equations--to find the time: [itex]v_f = v_i + a t[/itex].

Another (equivalent) way is to use the "impulse-momentum" theorem: [itex]F \Delta t = m \Delta v[/itex].
 
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i'm terrible at math, can you isolate time on one side of the equation?
 
  • #4
HallsofIvy
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What equation are you using?
 
  • #5
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Vf=Vi + at
 
  • #6
ZapperZ
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Serj said:
I want to know how to find the time it takes for a mass to reach a velocity if a force is applied to it.
Note that there is no mention of a constant force being applied here.

Zz.
 
  • #7
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Serj said:
Vf=Vi + at
[tex]t = \frac{v_f - v_i}{a}[/tex]

Make note of what ZapperZ said, though.
 
  • #8
Gokul43201
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Serj said:
i'm terrible at math, can you isolate time on one side of the equation?
cscott has done this for you, but you won't get very far with physics if you don't first brush up on elementary algebra. I strongly recommend you learn the math first.
 

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