medium · Enhanced ACT science
A researcher studies the gravitational force (F) between two masses as distance (r) changes:
| Distance (cm) | Force (N) |
| :--- | :--- |
| 10 | 100 |
| 20 | 25 |
| 40 | 6.25 |
What is the likely force at a distance of 50 cm?
- The force will be 0.0 N because at 50 cm the separation grows effectively too large to register.
- The force will be 3.125 N because 50 cm is simply one further 10 cm step past the last data point.
- The force will be 4.0 N because force is inversely proportional to the square of the distance.
- The force will be 12.5 N because force varies inversely with distance itself (1/r).
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