Q&A for How to Calculate Weight from Mass

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How do I get the gravitational force and multiply it by the mass?

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Gravitational force is proportional the two bodies' masses and the gravitational constant and is inversely proportional to the square of the distance between them. F= (m1 (Earth)*m2 (observed body)*G(constant))/r/r. G= 6.67408 × 10-11 m3 kg-1 s-2. However, for the sake of weight we usually take the gravitational accelration (g) which is equal to 9.81 m/s/s, usually rounded to 10 m/s/s. G (gravitational force/weight) = g (gravitational accelration) * m (mass of the observed body). If you use both methods, the two Gs should be equal barring some rounding errors.

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Does a scale measure weight or mass?

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It measures weight, because it measures the force gravity exerts on an object. But since we know what the gravitational constant is on Earth, we can convert that weight into mass (and many scales simply show the mass because they're calibrated to do so).

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If the mass of an object is 25kg on earth, what will be its weight on the moon?

Community Answer

The gravitational field strength of the moon is 1.6N/kg. This means that the weight of a 1kg mass object on the moon is 1.6N. Weight = mass x gravitational field strength Therefore, 25 kg multiplied by 1.6 N/kg, is 40 N.

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What if weight is expressed in kg? How do you convert it into mass in Newtons?

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The units of weight are in Newtons. If its in kilograms, its the mass of the object, not the weight.

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What is the mass of an object that has a weight of 80N on the moon?

Community Answer

We already have the weight and the gravity on the moon is 1.6m/s square so we will divide the F (weight) by g. Divide 80 N by 1.6 m/s square, and you will get the mass.

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Is my weighing machine showing mass or weight?

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Weighing machines show the weight of the object. Mass refers to what it is composed of.

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What does 3 kg/m^3 mean?

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This means kilograms per cubic meter.

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How do I calculate weight from mass if I know the gravity?

Community Answer

Multiply the mass (in kg) by the acceleration due to gravity (in m/s/s). Your answer is in Newtons (N). For example, a 100-kg object on earth (acceleration due to gravity: 9.81 m/s/s) weighs 100 x 9.81 = 981 N.

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The mass of an object is 6 kg on the surface of Earth. What will its mass be on the surface of the moon?

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6 kg. The mass remains the same, only the weight changes because there is a change in the gravitational acceleration.

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The mass of a stone is 100g. What is the weight of the stone?

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The weight is (0.1 kg)(9.80665 m/s²) = 0.980665 Newton.

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What if the mass is in g, not kg?

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Divide the mass by 1000. That will convert it to kg. Then use the formula above as usual.

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What is 200g converted to weight?

Community Answer

The weight is F = (mass)(force of gravity) = (0.2 kg)(9.8 m/s²) = 1.96 kg m/s² = 1.96 Newtons.

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Question

If a bathroom scale says something 'weighs' 100 lbs, is that actually its mass and it really weighs 32,200 pounds?

Community Answer

No. A scale measures weight, not mass. Remember, mass is a measure of the amount of matter in an object, while weight measures the force of gravity on that object. If a scale says "100 pounds," that is the object's "weight" (at the surface of the Earth).

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Question

How do you find mass with just force

Johnthan Fuentes

Community Answer

This is not possible. The equation you'd use is F=ma, where F = the force (in N), m = mass (kg), and a = acceleration (in m/s^2). To calculate mass of an object from a known force, you'll need to know the acceleration of that object.

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Question

How do I calculate mass from weight?

Community Answer

Multiply both together to get the force. Remember the formula: F= m×w, F= Force, m=mass, w=weight. So, just multiply it. For example, 60kg × 1.67 = 100.2N.

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Question

An equipment weighs 529N and 209N on Earth and Mars respectively. What is the acceleration due to the gravity of Mars?

Cabbache

Community Answer

The mass of the equipment can be found by F = ma, 529N = m x 9.81m/s^2, so m = 53.92Kg. Use F = ma again to find the acceleration on Mars. 209/53.92 = 3.875m/s^2.

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Question

How do I find the average weight of a number of people?

Cabbache

Community Answer

You add up their weight, and divide by the number of people. It's just finding the mean average.

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Question

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30m/s. Calculate the ball's energy.

Cabbache

Community Answer

K.E = 1/2 x mv^2 = 1/2 x 2.1 x 30 x 30 = 945 Joules.

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