why the gravity is different??????/?

Question

we had lab in school for free fall object. In the lab, all group had gravity of b/w 9.00 to 9.74 instead of 9.81.
if the human error and air resistance is neglected then why is the gravity is different by few %.????????

Answer 1

gravity cannot be different - for sure; it may vary at different places on earth (depending on its distance from the center of earth - inversely proportional to square of distance ) but at a given place it remains constant.... what you observe in the lab is mostly due to wrongly caliberated tools, disturbances due to air etc, visual mistakes and so on....

Answer 2

Gravity field is weight per unit mass and is a function of the radius square of the earth's masse's radius.Therefore neglecting errors of measurements assuming your instruments are 100% accuracy you will measure differently than 9.80665 meter/sec^2 which is the average gravity field.

The reason is that the radius of the earth is not Uniform =we have mountains and hills,and different sea levels.The radius at the equator is max and at the poles its minimum.Therefore at differrent location you will measure different gravity fields.

Answer 3

well you CANNOT ignore the human error and air resistance.
THAT is where you are getting the wrong measurments.

obviously most of the error comes in the timing of the free fall object. I assume you are using some sort of sled on an air cushion? Keep doing more experiments and your average should then eventually become closer to the actual value.

good luck.

Answer 4

Different materials have different gravity,this sounds a little different. I was trying to send commands to a satellite to park it in a synchronous orbit. we park it one day and the next it had drifted from its position. After several months it was deter maned that the gravity has mountains and Vallie's in the gravity field ,depending on the mass of the mountains or valleys below.It was deter maned that it was much easier to park in the Vallie's than in top of the mountain.

Answer 5

It isn't. It's differences in observational measurements. Gravometric distortions occur in different parts of the Earth's surface, but not in the lab.