Explain Motion under gravity?
Answers
Answer:
Vertical motion under gravity
When you throw an object upwards, it will eventually fall back to the ground under the earth's gravity. In fact all objects near the earth's surface fall with a constant acceleration of about 9.8 (we usually take 10 for the sake of simplicity in calculation). This is called the acceleration due to gravity and is usually denoted by the symbol g.
An object that is thrown vertically upwards decelerates under the earth's gravity. Its speed decreases until it attains a maximum height, where the velocity is zero. Then it is accelerated uniformly downwards under gravity. When it returns to the point of projection , it has the same speed as that at the instant of projection. In addition, the duration of the upward motion is exactly equal to that of the downward motion.
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Motion Under Gravity-
=> Every body is itself attracted towards itself by a gravitational force which is known as gravity.
=> We will say motion under gravity when the body moves due to effect of gravitational attraction force.
=> It is a constant quantity and denoted by 'g'.
g = 9.8 m/sec^2 or almost 10.
g = 980 cm/sec^2.
g = 32 ft /sec^2.
=> If a body moves either in upward or downward direction acceleration due to gravity always directed vertically downward.
=> If a body released or dropped or fall freely than its initial velocity is always zero.
Some Fixed Concept Gravity-
=> Initial velocity of hydrogen balloon or rocket is always taken zero.
=> If a body is projected or fired or thrown than its initial velocity is always non-zero.