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# What does Kepler's second law imply?

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### Quick Answer

Kepler's second law implies that the closer a planet is to its star, the faster the planet travels. This law is related to conservation of angular momentum. The law is important because the planets' orbits around stars are not circular, so planets are closer to their stars at certain points.

Know MoreKepler's second law assumes that if a line is drawn between a star and its planet, for any set time period, that line sweeps out the same area each period, no matter where in orbit the planet is at the time.

For example, if the time period is 10 days, the line between the planet and the star sweeps out equal areas every 10 days. This is possible because when the planet is closer to its star, it moves faster, and when it is further away from its star, it moves slower. At aphelion, the point in a planet's orbit furthest away from the star, the planet moves the slowest. At perihelion, the planet is closest to its star and moves the fastest. This is because of the planet's conservation of angular momentum.

Angular momentum is directly proportional to an object's moment of inertia and angular velocity. When a planet's distance from its star increases, its moment of inertia increases. For its angular momentum to remain the same, the planet's angular velocity has to decrease.

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## What is Newton's second law in terms of Atwood's machine?

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Full Answer >**Newton’s second law states that the force acting on an object is directly related to the acceleration.**The law is formulated as F = m x a, where F = force, a = acceleration and m = mass of the object in motion. In terms of Atwood’s machine, a force equal to the difference in the suspended weights accelerates the total mass, m1+ m2.Filed Under: -
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## What is the formula for Hooke's law?

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Full Answer >**The formula for Hooke's law is given by F = kx, where x is the displacement in the spring in meters, k is the force constant or spring constant and F is the amount of force applied on the spring in Newtons.**Hooke's law states that the amount of stress applied on an object to deform it is proportional to the amount of deformation. It can be used to determine the force, displacement and force constant in a stretched spring.Filed Under: -
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## What is Hooke's law?

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Full Answer >**Hooke's law, also known as the law of elasticity, states that for small deformations of an object, the size of the deformation or the displacement is directly proportional to the deforming load or force.**The object returns to the original size and shape under these conditions upon the removal of the force. Deforming forces are applied on solids by bending, compressing, stretching, squeezing or twisting.Filed Under: -
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## What is the law of interaction?

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Full Answer >**The law of interaction is also Newton's third law of motion, stating that each action brings an equal and opposite reaction.**Forces are either pushes or pulls resulting from the interactions between objects. Some interactions come from contact, while others come from forces that act over distance, such as magnetism, electricity or gravity.Filed Under: