sign convention for free fall class 11
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Just decide any direction to be positive...
Anything going in the opposite direction will be obviously.. Negative.
Now there isn't any predefined universal sign convention as far variables like velocity, force, displacement are concerned.
Whereas when talking about 'g' and certain other fixed quantities..
A more commonly used direction is present.( downward for"g" or -ve Y-axis)
But in order to solve numericals and get the right answer you can take any direction ( take g upwards ) but make changes accordingly in other variables and you'll be just fine.
When placing the values in kinematics equations. Always use sign convention and take care of directions.
Especially those "three" equations.
Just choose one to be positive and opposites will be negative.. And try to RESOLVE quantities in other directions into your desired ones.
Best of luck!!
Anything going in the opposite direction will be obviously.. Negative.
Now there isn't any predefined universal sign convention as far variables like velocity, force, displacement are concerned.
Whereas when talking about 'g' and certain other fixed quantities..
A more commonly used direction is present.( downward for"g" or -ve Y-axis)
But in order to solve numericals and get the right answer you can take any direction ( take g upwards ) but make changes accordingly in other variables and you'll be just fine.
When placing the values in kinematics equations. Always use sign convention and take care of directions.
Especially those "three" equations.
Just choose one to be positive and opposites will be negative.. And try to RESOLVE quantities in other directions into your desired ones.
Best of luck!!
manasviverma:
so it means when i consider upward to be + then velocity and heighy also be positve
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