State what is represented by gravitational field lines - AQA - A-Level Physics - Question 6 - 2017 - Paper 2
Question 6
State what is represented by gravitational field lines.
[1 mark]
Figure 6 shows the gravitational field above a small horizontal region on the surface of the Earth... show full transcript
Worked Solution & Example Answer:State what is represented by gravitational field lines - AQA - A-Level Physics - Question 6 - 2017 - Paper 2
Step 1
State what is represented by gravitational field lines.
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Answer
Gravitational field lines show the direction (and relative magnitude) of force on a mass (placed in the force field).
Step 2
Suggest why the field lines converge over a small area at K.
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Answer
The lines of force are closer together at K, indicating that the gravitational force is stronger in that area. This occurs because the potential at K is lower compared to the surrounding area.
Step 3
Explain any change in the speed of the ball as it approaches K.
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Answer
As the ball approaches K, it will speed up due to the gravitational pull, which is directed downward. The gravitational force, being constant, causes the ball to accelerate as it moves deeper into the gravitational field.
Step 4
Explain why the lines of force shown in Figure 7 cannot represent a gravitational field.
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Answer
The lines of force in Figure 7 show repulsion between two like charges, which is inconsistent with gravitational fields that only exhibit attraction between masses.
Step 5
State which object L or M has a charge with the greater magnitude.
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Answer
object L
Step 6
State which object L or M has a positive charge.
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object M
Step 7
Draw, on Figure 7, an equipotential line that passes through point N.
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Answer
The equipotential line should be drawn horizontally, ensuring it crosses the field lines at right angles, illustrating that no work is done moving along the line.
