EVERYDAY SCIENCE

Detailed explanation-1: -Does Newton’s law of gravity agree with that prediction? Note that the mass of a photon is zero. No, because according to Newton, the gravitational force on a photon should be zero.

Detailed explanation-2: -Newton’s Second Law states that force is needed to accelerate or decelerate a body. In practice this means astronauts must learn how to push themselves carefully through their spacecraft, or else they will simply float around helplessly.

Detailed explanation-3: -In today’s language, the law states that every point mass attracts every other point mass by a force acting along the line intersecting the two points. The force is proportional to the product of the two masses, and inversely proportional to the square of the distance between them.

Detailed explanation-4: -Written as F = ma, Newton’s second law of motion states that the force acting on an object (F) is equal to the object’s mass (m) times the acceleration it undergoes (a). So, in the case of a rocket, the heavier the spacecraft is, the more force it needs from engine thrust to start accelerating.