how to calculate the value of g in laboratory?
Answers
Answer:
This question is wrong. There is no such mathematical term ‘gravity’. What we actually measure here on Earth, is the acceleration due to gravity.
Acceleration due to gravity at some point is numerically equal to the force you need to apply to keep an object of unit mass (1kg in SI units) in equilibrium (stationary) against the force of gravity at that point. It is represented by ‘g’.
Acceleration due to gravity is pretty much constant over the surface of the Earth and varies only slightly from city to city.
So you can calculate the force due to gravity on an object by multiplying it’s mass ‘m’ with the value of ‘g’ at that point. Force = m x g
Now a common experiment we use to measure the value of ‘g’ accurately on Earth is using a Simple Pendulum.
This is a simple pendulum. A small mass suspended by a string of known length. When you push this mass to the side and let it go, it swings. Amazingly the time taken for this pendulum to reach back to your hand is independent of how far you take it from B before letting go. As long you don’t take it too far. Making it completely horizontal and then letting go won’t work.
So when you leave it from point A it swings to B then C then back to B then back to A. The time taken, ‘T’, to reach A again is dependent only on the length of the pendulum string ‘L’ and the acceleration due to gravity in that region, ‘g’
Answer:
to determine the value of g in laboratory