
#1
Jul1704, 06:26 AM

P: 202

How do you calculate the instantanius velocity of an object from a VelocityTime graph?




#2
Jul1704, 06:32 AM

Sci Advisor
PF Gold
P: 2,226

The instaneous velocity of the object described in the graph at a partycular time t, is simply it's velcoity at that time. In other words you don't have to do any calculus (like you weould have to do if you wished to find the average vellcoity over a certain time) just read the value from the graph.




#3
Jul1704, 06:37 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,900

If you have a "positiontime" graph, then the velocity is the slope of the tangent line at the point. If you have a "velocitytime" graph, then the acceleration is the slope of the tangent line. 



#4
Jul1704, 06:43 AM

P: 202

vELOCITYTIME GRAPH
sorry i asked the wrong question.
How do you calculate the Acceleration at a given time? 



#5
Jul1704, 06:47 AM

P: 202

and also the tangent line is curved *the train accelerates at diffrent acceleratio*




#6
Jul1704, 06:48 AM

P: 28

accleration: velocity per unit time or V/t. It is just as is as this one.




#7
Jul1704, 06:49 AM

Sci Advisor
PF Gold
P: 2,226

a = dv/dt
i.e. differentiate 



#8
Jul1704, 06:53 AM

P: 202

can you explain abit more please




#9
Jul1704, 07:15 AM

Sci Advisor
PF Gold
P: 2,226

If you only have the graph find the gradient of the grpah at that particular point, if you have the equation differentiate v with respect to t.




#10
Jul1704, 10:05 PM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,900

As I said before: if you have a "Velocitytime" graph, draw a tangent to the curve at the given value of t and find its slope.



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