Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
Deadly_king:
--- Quote from: TJ-56 on November 11, 2010, 05:33:28 pm ---On which formula is the one you stated based on?
thanx
--- End quote ---
Just the principle of conservation of energy. ;)
TJ-56:
Thank you all guys
and
WISH YOU ALL THE BEST OF LUCK FOR TOMORROW!
$!$RatJumper$!$:
Is s = ut + (1/2 * a * t2) and v2 = u2 + (2 * a * s) only for vertical movement of an object?
And is speed = distance / time only for horizontal movement?
Dania:
No, they can be used for either vertical or horizontal.
The only difference is that acceleration would be taken as -9.81 ms-2 if the object is going up. If it moving horizontally, the acceleration can be calculated using v2=u2 + 2as or any other motion equation regarding acceleration.
You should remember that speed is a scalar, and velocity is vector. In many questions, they will state whether it is speed or velocity. If they say it is speed, you should use the equation Speed=Distance/Time to find what it is you're looking for.
I hope I was helpful :)
Deadly_king:
--- Quote from: $!$RatJumper$!$ on November 11, 2010, 08:12:19 pm ---Is s = ut + (1/2 * a * t2) and v2 = u2 + (2 * a * s) only for vertical movement of an object?
And is speed = distance / time only for horizontal movement?
--- End quote ---
--- Quote from: Dania on November 11, 2010, 08:25:25 pm ---No, they can be used for either vertical or horizontal.
The only difference is that acceleration would be taken as -9.81 ms-2 if the object is going up. If it moving horizontally, the acceleration can be calculated using v2=u2 + 2as or any other motion equation regarding acceleration.
You should remember that speed is a scalar, and velocity is vector. In many questions, they will state whether it is speed or velocity. If they say it is speed, you should use the equation Speed=Distance/Time to find what it is you're looking for.
I hope I was helpful :)
--- End quote ---
Very good answer. :D
I would just like to add that for any of the equations of motion to be valid, acceleration should be constant. ;)
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