Question

If keplers second law states that Line from the sun to planet sweeps equal areas in equal intervals of time. So, for that velocity of planet should vary with respect to it's position. Then, according to newton's first law of motion, increase in speed of a planet say earth, should give all of us a jerk at regular intervals?

Answer 1

The increase or decrease in the velocities of the planets is not a instanteneous one but its a continuous process i.e for ex if the speed of the earth when it is at the farthest from the earth is X and when the earth is at the closest be Y (Y>X) then the speed do not changes at sudden moment but it changes gradually and as the change in its velocity is so less and the size of the earth is so large so we can not feel the change in the speed its can only be known by the change in the length of the day or night. So the change in the speed of the earth is not felt as the acceleration or retardation takes place at a constant rate. And hence we do not feel any jerk though the speed changes at a very gradual and slow rate.