A big stone and small are dropped from the roof of the house at the same time. Which one will reach the ground first(ignore the effect of air)?An object is thrown vertically upwards and rises to a height of 10m. Calculate the velocity with which the object was thrown upwards? Take g=9.8 metre per second square. OR Find out how the acceleration due to gravitation varies as one goes to a depth "d" inside the earth from the surface. (3)
Answers
Answer:
Explanation:
Falling objects form an interesting class of motion problems. For example, we can estimate the depth of a vertical mine shaft by dropping a rock into it and listening for the rock to hit the bottom. By applying the kinematics developed so far to falling objects, we can examine some interesting situations and learn much about gravity in the process.
Gravity
The most remarkable and unexpected fact about falling objects is that, if air resistance and friction are negligible, then in a given location all objects fall toward the center of Earth with the same constant acceleration, independent of their mass. This experimentally determined fact is unexpected, because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavy ones.
Positions of a feather and hammer over time as they fall on the Moon. The feather and hammer are at the exact same position at each moment in time.
Figure 1. A hammer and a feather will fall with the same constant acceleration if air resistance is considered negligible. This is a general characteristic of gravity not unique to Earth, as astronaut David R. Scott demonstrated on the Moon in 1971, where the acceleration due to gravity is only 1.67 m/s2.
In the real world, air resistance can cause a lighter object to fall slower than a heavier