Q3) Complete the sentence:
force of the Earth is called gravity.
According to you how will gravity act on this apple tree. Explain in the
form of illustration.
Answers
Answer:
Near the surface of the Earth, any object falling freely will have an acceleration of about 10 m/s2. Objects falling through a fluid eventually reach terminal velocity. At terminal velocity, the object moves at a steady speed in a constant direction because the resultant force acting on it is zero. For example, a skydiver falling spread-eagled through the air reaches a maximum speed of about 53 m/s.
Three stages of falling
There are three stages as an object falls through a fluid:
at the start, the object accelerates downwards due to the force of gravity
as its speed increases, frictional forces such as air resistance or drag increase
at terminal velocity, the weight of the object due to gravity is balanced by the frictional forces, and the resultant force is zero
The weight of an object does not change as it falls, as long as it stays whole.
A skydiver
The diagram shows what happens to the speed of a skydiver from when they leave the aircraft, to when they reach the ground after their parachute opens.