Exam-style question
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A graph shows the gravitational field strength (g) against distance (r) from the center of a planet. Describe the shape of the graph and explain what it indicates about the gravitational field strength as distance increases.
Model answer
What a good answer should say
- The graph shows that gravitational field strength decreases as the distance from the center of the planet increases.
- This indicates that the force of gravity weakens with distance, following an inverse-square relationship.
Explanation
Why this works
The evidence is the shape of the graph, which typically shows a decreasing trend. This indicates that as one moves away from the mass, the gravitational pull diminishes.
The implication is that objects further from the planet experience less gravitational force, which is crucial for understanding satellite motion and orbital mechanics. Therefore, the conclusion is that gravitational field strength is not constant and varies with distance.
Common mistake
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