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: On [[Earth]] the [[Gravitational Field Strength|gravitational field strength]] is 9.8[[N/kg]] correct to two [[Significant Figures|significant figures]].
===Example CalculationsExamples==={| class="wikitable"|-|[[File:WeightTennisBall.png|center|100px]]|[[File:WeightBowlingBall.png|center|200px]]|[[File:WeightBoat.png|center|250px]]|-| style="height:20px; width:200px; text-align:center;" |[[Weight]] makes a tennis ball fall to the ground.| style="height:20px; width:200px; text-align:center;" |[[Weight]] holds the bowling ball to the ground.| style="height:20px; width:200px; text-align:center;" |If the [[weight]] of a boat were bigger than the [[upthrust]] the boat would sink.|-|[[File:WeightCar.png|center|250px]]|[[File:WeightSubmarine.png|center|250px]]|[[File:WeightPlane.png|center|250px]]|-| style="height:20px; width:200px; text-align:center;" |The [[weight]] of the [[car]] acts from its [[Centre of Mass|centre of mass]].| style="height:20px; width:200px; text-align:center;" |The submarine has the same [[weight]] under the water as it would on land, but in the water this is [[Balanced Forces|balanced]] by the [[upthrust]].| style="height:20px; width:200px; text-align:center;" |Planes can be very heavy but their [[weight]] is [[Balanced Forces|balanced]] by the [[lift]].|} ===Equation===: Weight = Mass x Gravitational Field Strength: <math>W = m \times g </math>Where: <math>W</math> = The [[weight]] of the [[object]]. <math>W = m \times g </math> = The [[mass]] of the [[object]]. <math>W = m \times g </math> = The [[Gravitational Field Strength|gravitational field strength]] of the [[Gravitational Field|gravitational field]] the [[object]] is in. ===Calculating Weight from Mass and Gravitational Field Strength===
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