Question

Newton's 4th law of motion ?
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Answer 1

Answer:

In an inertial frame of reference, the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. ... Some also describe a fourth law which states that forces add up like vectors, that is, that forces obey the principle of superposition.

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Answer 2

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➢ Newton's Law of gravitation is called Newton's fourth law.

➢ It states that every point mass attracts every other point mass by a force acting along the line intersecting both points. The force is proportional to the product of the two masses, and inversely proportional to the square of the distance between them.

The equation for universal gravitation thus takes the form:

F= G m1 × m2/ r²

➢ Where F is the gravitational force acting between two objects, m1 and m 2 are the masses of the objects, r is the distance between the centres of their masses, and G is the gravitational constant whose value is 6.67 × 10e -7 Nm²/kg².

➢ The first test of Newton's theory of gravitation between masses in the laboratory was the Cavendish experiment conducted by the British scientist Henry Cavendish in 1798.

➢ It took place 111 years after the publication of Newton's Principia and approximately 71 years after his death.

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