Gravitational Forces

Science — First Preparatory

Worked examples on weight

Comparison aspect	Main idea	Keywords
Example 1	an object of mass 5 kg on the Earth. Weight = 5 × 9.8 = 49 N	objectmassEarthWeight
Example 2	a person of mass 60 kg. Weight on the Earth = 60 × 9.8 = 588 N and weight on the Moon = 60 × 1.6 = 96 N. Notice that the mass did not change but the weight fell to about one sixth of its value on the Earth	personmassWeightEarth
Example 3	an object weighs 98 N on the Earth. Its mass = 98 ÷ 9.8 = 10 kg	objectweighsEarthmass

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