
Concept explainers
Counterarguments to reject the friend’s hypothesis.

Answer to Problem 1CQ
Gravitational force is always attractive but the electrical force can be either attractive or repulse.
Increase in charge on an object does not increase pull of Earth.
Explanation of Solution
Gravitational force is always attractive but the electrical force can be either attractive or repulsive.
The two massive objects should experience force of attraction and force of repulsion according to the proposed hypothesis. But in nature, objects due to the property of their mass always experience force of attraction between them and they never experience force of repulsion between them.
As per the hypothesis, increase in charge on an object, will increase the force from earth, but in nature, the weight of the object is not observed to change with increase in the charge on the object.
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Chapter 16 Solutions
Physics
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