AQA GCSE Calculating Weight (Combined Science)
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Calculating Weight
On Earth, the value for g = 9.8 N/kg. On different planets, the vary of g can vary.
Sample Questions
1.A man has a mass of 60kg on Earth. Assuming g = 9.8N/kg, calculate his weight
W = m x g
W = 60 x 9.8
W = 588N
2. The label on a weight has worn off and it cannot be seen. However, when Ben placed the weight on a balance it had a mass of 60g. Calculate its weight, assuming that g = 9.8N/kg
Convert 60g to kg
60/1000 = 0.06kg
W = m x g
W = 0.06 x 9.8
W = 0.588N
3. Planet Zeeburger has an unknown value for gravitational field strength. However, Barry has a mass of 75kg and a weight of 450N on Zeeburger. Calculate the value for gravitational field strength
g = W/m
g = 450/75
g = 6N/kg
4. On Earth a person has a weight of 1176N. Calulate their mass. Assume g = 9.8N/kg.
m = W/g
m = 1176/9.8
m = 120kg
Practice Questions
1.Calculate the weight of a tennis ball that has a mass of 45g. Assume g = 9.8N/kg
2. On Planet ABCD a man has a weight of 2000N and a mass of 100kg. Calculate the value for gravitational field strength for planet ABCD.
3. Calculate the mass of an object that has a weight of 5000N on Earth, when g = 9.8N/kg
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