Example from Physics, 7.2 Newton's Law of Universal Gravitation and Einstein's Theory of General Relativity

Change in g

The value of g on the planet Mars is 3.71 m/s². If you have a mass of 60.0 kg on Earth, what would be your mass on Mars? What would be your weight on Mars?

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Strategy
Weight equals acceleration due to gravity times mass: $W = m g$ . An object’s mass is constant. Call acceleration due to gravity on Mars g_M and weight on Mars W_M.
Solution
Mass on Mars would be the same, 60 kg.

$W_{M} = m g_{M} = (60.0 kg) (3.71 {m/s}^{2}) = 223 N$
7.4

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Strategy

Solution

Strategy

Solution