Q&A for How to Calculate Force of Gravity

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How do I find the mass of the moon?

Community Answer

Check out same steps as mentioned below. But remember gravity on moon is 1/6th of gravity on earth.

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A mass of 25 kg weighs 123 Newtons on another planet. What is the gravity on the planet?

Community Answer

The "gravity" on the surface of a planet is it's acceleration (the rate of increase in speed as an object falls). Fg (the force of gravity) is m x g (acceleration of gravity), in m/(s squared), so g is Fg / m = 123 N / 25 kg ~= 4.92 m/(s squared).

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How do I find the value of acceleration due to a gravity at a height of 2R from the surface of the earth?

Community Answer

If you want to know what the gravity would be when you are 3 earth-radii away from the center of earth, then the gravity would be 1/9th normal gravity. You're multiplying by 3 on the bottom, so 1/3, but then it's squared. Acceleration would then be 1.09 meters per second squared.

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Can we use the diameter of a planet for "R" in the gravity formula?

Community Answer

"R" is the radius. The diameter is twice the radius. So just divide the diameter by two to get the radius.

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Question

Is the gravitational constant the same on other planets?

Community Answer

No, because different planets have different masses.

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How do I calculate gravity if I know the N of gravity and the weight of the item?

Community Answer

If you know the force in newtons, 'N' and the mass of the item in kilograms, then you can apply the formula F = m * a. By rearranging this equation, the acceleration of an object (the gravity) is: a = F / m where 'F' is newtons, 'm' is mass in kilograms and 'a' is acceleration (due to gravity in this case) in meters per second per second.

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If I have two identical billy carts placed on top of a hill, one with 150mm wheels the other with 400 mm wheels, which one will get to the bottom of the hill first?

Community Answer

Having smaller wheels means the mass is closer to the centre, therefore the gravitational force is higher than with larger wheels.

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Mr. Thurman has a mass of 67 kg. What is the force of gravity pressing down on him?

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Community Answer

W=mg = 67.10 kg m/s2 = 670 N Weight of Mr. Thurman is 670N Fun note: Weight machines actually show the normal reaction, and then divide it by acceleration due to gravity (g). If the weighing machine is in a horizontal position, it will measure the normal reaction as 670N. The computer then divides it by 10 and shows the reading as 67 kg.

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