A rover has a mass of 180 kg. Find its mass and its weight on the Earth, where g = 9.8 m/s²; on the…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A rover has a mass of . Find its mass and its weight
- on the Earth, where ;
- on the Moon, where ;
- on Mars, where .
Need a reminder? The key ideaShow
Mass (kg) is the amount of matter, the same everywhere. Weight is the pull of gravity on it, , in newtons, and it depends on where you are.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. everywhere.
Plan. The mass is the same everywhere. Work out for each place.
Step 1. Earth. .
Step 2. Moon. .
Step 3. Mars. .
Answer: The mass is in all three places. The weights are , and .
Check. The Moon's is about a sixth of the Earth's, and , close to . Good.
Watch out. A weight in kilograms is a mistake of units. Weight is a force and is measured in newtons.
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