Two objects attract each other with a force of 36 N.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Two objects attract each other with a force of . The distance between their centres becomes three times as large. What is the new force? Give the reason.
Need a reminder? The key ideaShow
The law of gravitation: , with and the distance between the centres. The Earth: , .
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.
Step 1. Three times the distance gives of the force.
Step 2. .
Answer: , because the force falls with the square of the distance.
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