An 80 kg astronaut stands on the Moon. The Moon's gravitational field strength is 1.6 N/kg.
03[1 mark]
Find the astronaut's weight on the Moon, in N.
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8.0 newtons
50 newtons
128 newtons
800 newtons
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Weight = mass × gravitational field strength. = 80 × 1.6. = 128 N. That is the third option. 8.0 N comes from dividing the mass by 10, and 50 N from dividing the mass by 1.6, but weight is found by multiplying. 800 N multiplies by 10, the field strength on Earth, so it is the astronaut's weight on Earth, not on the Moon.
1 mark
How the marks are earned
- Choose 128 N: weight = mass × gravitational field strength = 80 × 1.6 = 128 N.
- The right option alone earns the mark with no working needed. One answer only: two answers earn nothing, and a circled or underlined right option counts if the box is blank.