Physics, 16.12.2019 22:31 smooth5471

Compare and contrast the electric force with the gravitational force

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Answer from: alexthebest3976

Similarities:

- The gravitational force and the electric force have a similar form.

In fact, gravitational force is given by:

$F=G\frac{m_1 m_2}{r^2}$

where G is the gravitational constant, m1 and m2 are the masses of the two objects, r is the separation between the two objects.

The electric force is given by:

$F=k\frac{q_1 q_2}{r^2}$

where k is the Coulomb constant, q1 and q2 are the charges of the two objects, r is the separation between the two objects.

As we see, the two forces have same dependency on the distance (inversely proportional to the square of the distance)

- Both forces are non-contact forces: this means that in both cases, the two objects do not to be in contact with each other, because the force is still acting from a distance also.

Differencies:

- The gravitational force is attractive only; on the contrary, the electric force can be either attractive or repulsive, depending on the relative sign of the two charges. In fact, when the two charges have same sign, the force is repulsive; when the two charges have opposite sign, the force is attractive.

- The gravitational force is much weaker than the electric force. This can be seen by comparing the value of the constant in the two formulas; we have:

$G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}$ for the gravitational force

$k=8.99 \cdot 10^9 Nm^2C^{-2}$ for the electric force

As we see, the electric force is much stronger than the gravitational force.

Answer from: Quest

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by mathematical calculations before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of uranus led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

Answer from: Quest

the answer is kevlar

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