Molly Ayala
Electric force and gravitational force are two fundamental forces that govern the interactions between objects in the universe. Electric forces arise from the interaction of charged particles, such as electrons and protons, while gravitational forces act between masses. A key difference between the two forces is that electric forces can be either attractive or repulsive, depending on the charges of the particles, whereas gravitational forces are always attractive. In everyday life, we don't feel electric forces because most objects are electrically neutral, with equal numbers of positive and negative charges, whereas the force of gravity is ever-present, pulling us towards the Earth. However, when comparing the strengths of these forces, electric force is significantly stronger than gravitational force. For example, consider the gravitational attraction between two apples, which is practically negligible, whereas if you were to charge one apple positively and another negatively, the electric force between them would be gigantic in comparison.
| Characteristics | Values |
|---|---|
| Relative strength | Electric force is much stronger than gravitational force |
| Everyday life | Gravitational force is felt in everyday life, whereas electric force is neutralized by the presence of positive and negative charges |
| Influence on existence | Gravitational force is always attractive and cumulative, giving us weight |
| Interaction with objects | Gravitational force is dominant for objects with large masses |
| Type of force | Gravitational force is always attractive, whereas electric force can be attractive or repulsive |
| Proportionality | Gravitational force is proportional to the masses of interacting objects, while electric force is proportional to the magnitudes of the charges of interacting objects |
| Inverse proportionality | Both forces are inversely proportional to the square of the distances between them |
| Calculation | Gravitational force can be calculated using Newton's universal law of gravitation, while electric force is calculated using Coulomb's Law |
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What You'll Learn
- Electric force is much stronger than gravitational force
- Gravitational force is attractive, electrostatic force can be attractive or repulsive
- Gravitational force is negligible on a small scale
- Electric force is neutralised by positive and negative charges
- Gravitational force is dominant for objects with large masses
Electric force is much stronger than gravitational force
The reason why we don't feel electric forces in our everyday lives is that almost every negative charge (electron) in the universe is balanced by a positive charge (the nucleus of an atom). This equalization neutralizes the electric force, making it unnoticeable most of the time. In contrast, the gravitational force is always attractive and cumulative. All the atoms in the Earth pull us toward its center, giving us weight. However, the electrical forces of electrons and atomic nuclei have opposite charges that cancel each other out, so we don't experience any "electrical weight" from the Earth.
To further illustrate the difference in strength between electric and gravitational forces, we can look at the work of Robert A. Millikan in 1913. Millikan used tiny electrically-charged oil drops where the downward pull of gravity was balanced by an upward electrical force. This experiment demonstrated that electric forces can easily counteract the force of gravity, highlighting the greater strength of electric forces.
Additionally, the electrostatic force, which is a type of electric force, is dominant and much greater than the gravitational force for particles like electrons and protons. Gravitational force, on the other hand, generally dominates for objects with large masses. This is because gravitational force is always attractive, while electrostatic force can be attractive or repulsive, depending on the charges involved. Like charges repel each other, so when there are equal numbers of positive and negative charges, the forces tend to cancel each other out.
In summary, electric force, particularly electrostatic force, is much stronger than gravitational force. Gravitational force is weak and often negligible on a small scale, especially when compared to the immense strength of electric forces.
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Gravitational force is attractive, electrostatic force can be attractive or repulsive
The gravitational force between two objects is proportional to the masses of the objects and is always attractive. On the other hand, the electrostatic force between two objects is proportional to the magnitudes of the charges of the objects and can be attractive or repulsive depending on the sign of the charges. Unlike charges attract, and like charges repel.
In everyday life, we do not feel the electric force because almost every negative charge (electron) in the universe is nestled up close to a positive charge (the nucleus of an atom). This equalizes (neutralizes) the electric force. However, we are constantly aware of the gravitational force, which is extremely weak compared to the electric force.
The gravitational force between two apples, for example, is practically nothing. The electric force between two apples is also zero because there are equal numbers of positive and negative charges in both apples, and everything is electrically neutral. However, if we were to charge one apple to +1 coulomb and the other to -1 coulomb, the force of attraction would be gigantic.
In 1913, Robert A. Millikan published a paper describing a definitive measurement of the charge of the electron. He used tiny electrically-charged oil drops on which the downward pull of gravity was carefully balanced by an upward electrical force. Chiao proposes a similar experiment using pairs of "Millikan oil drops" made of superfluid liquid helium, each with one electron charge and a mass of about 1.9 micrograms. These would be trapped in a magnetic field and held in a delicate balance between gravitational attraction and electrical repulsion.
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Gravitational force is negligible on a small scale
When comparing electric force to gravitational force, it is important to note that the gravitational force is extremely weak compared to the electric force. In fact, on a small scale, gravitational force is considered negligible, while the interactions of individual charged particles due to electric forces become important.
This can be observed in the interactions of electrons or protons, where electrostatic force is dominant and far greater than the gravitational force. On the other hand, for objects with large masses, such as the Earth, gravitational force becomes the dominant factor. This is because gravitational force is always attractive, pulling objects with mass towards each other, while electric forces can be attractive or repulsive, depending on the charges involved. Like charges repel each other, while unlike charges attract.
The strength of the electric force compared to the gravitational force can be illustrated through a thought experiment. Consider two apples, each with a volume of about 100 cubic centimeters and weighing roughly 100 grams. The gravitational force between these two apples is practically nothing. In contrast, if we were to charge one apple with +1 coulomb and the other with -1 coulomb, the electric force between them would be gigantic. The force would be comparable to having ten fully loaded oil supertankers sitting on your head.
The reason we do not experience this electric force in everyday life is that most objects are electrically neutral, with equal numbers of positive and negative charges that cancel each other out. In the case of atoms, for example, the negative charge of the electrons is neutralized by the positive charge of the nucleus, resulting in no net electric force. However, the gravitational force is always attractive, and all the atoms in the Earth conspire to pull us towards its center, giving us weight.
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Electric force is neutralised by positive and negative charges
Electric force is extremely strong when compared to gravitational force. In fact, electricity is almost a trillion-trillion-trillion-trillion-trillion times stronger than gravity. However, we do not feel the electric force in everyday life because almost every negative charge (electron) in the universe is nestled up close to a positive charge (the nucleus of an atom). This equalizes, or neutralizes, the electric force.
The presence of equal numbers of positive and negative charges in an object makes it electrically neutral. For example, an apple has equal numbers of positive and negative charges, and everything within it is electrically neutral. However, if we were to remove one electron from one out of every 55,000 molecules in an apple, we would give it a positive charge. We could then take that electron and put it on another apple, giving it a negative charge. Now, if we place these two apples with opposite charges one meter apart, the force of attraction is gigantic. This force is so strong that it is the equivalent of having ten fully loaded oil supertankers sitting on your head.
The electric force between two charges can be computed using Coulomb's Law. The force between two one-coulomb charges placed one meter apart is extremely strong. This force is in accordance with Coulomb's Law, which states that two like charges will repel each other, while two opposite charges will attract each other. A positive charge causes the electric field to point away, while a negative charge causes it to point towards it. When a positively charged object comes into contact with a negatively charged object, the charges are neutralized, and the electric force is equalized.
In summary, electric force is neutralized by the presence of both positive and negative charges. When the number of positive and negative charges is equal, the electric force is neutralized, and the object is electrically neutral. This is why we do not feel the electric force in our daily lives, as the positive and negative charges in the universe tend to be close to each other and neutralize each other's effects.
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Gravitational force is dominant for objects with large masses
While the electric force is usually stronger than the gravitational force, there are scenarios where the gravitational force is dominant. One such scenario is when dealing with objects that have large masses.
Gravitational force is always attractive, whereas electric forces can be attractive or repulsive, depending on the charges involved. Like charges repel each other, while unlike charges attract. In most cases, objects are nearly electrically neutral, with equal numbers of positive and negative charges, causing the electric forces to cancel each other out.
On a small scale, where individual charged particles are important, gravitational force is often negligible compared to electric force. For example, the electric force between a pair of electrons is about 2.40 x 10^43 times stronger than the gravitational force between them. However, on a larger scale, such as between the Earth and a person, the cumulative effect of gravity becomes significant and dominant.
The gravitational force is proportional to the masses of the interacting objects, while the electric force is related to the magnitudes of the charges of the objects. So, for objects with large masses, the gravitational force becomes dominant. This is because the large masses result in a stronger gravitational force, which can exceed the electric force between the objects.
In some experiments, such as those conducted by Robert A. Millikan and Chiao, the gravitational and electric forces between small charged droplets were balanced to study their interactions. By manipulating the charges and masses of the droplets, the experiments demonstrated scenarios where the electric and gravitational forces were equal and opposite, or where the gravitational force was significantly larger than the electric force.
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Frequently asked questions
In everyday life, we don't feel the electric force because almost every negative charge (electron) is close to a positive charge (the nucleus of an atom), equalizing and neutralizing the electric force. On the other hand, we are very aware of the gravitational force, which is always attractive and cumulative.
On a small scale, the gravitational force is negligible, and the interactions of individual charged particles, dominated by electrostatic forces, become important. This is because most objects are nearly electrically neutral, with attractive and repulsive Coulomb forces cancelling each other out.
On a larger scale, the gravitational force dominates as it is always attractive and acts between objects with large masses. The electric forces tend to cancel out due to the presence of equal positive and negative charges.
Both electric and gravitational forces are inversely proportional to the square of the distance between the objects. However, they are not directly related, as the gravitational force is proportional to the masses of the objects, while the electric force depends on the magnitudes of the charges.
In 1913, Robert A. Millikan's experiment with tiny electrically-charged oil drops demonstrated the balance between gravitational pull and upward electrical force. Chiao later proposed using pairs of superfluid helium drops with one electron charge each to explore the equivalence between electrical and gravitational forces and their responses to waves.
