Read the paragraph very carefully and answer the following question (ANY FOUR)
‘’We have learnt that the earth attracts objects towards it. This is due to the gravitational
force. Whenever objects fall towards the earth under this force alone, we say that the
objects are in free fall. While falling, there is no change in the direction of motion of the
objects. But due to the earth’s attraction, there will be a change in the magnitude of the
velocity. Any change in velocity involves acceleration. Whenever an object falls towards the
earth, an acceleration is involved.
Answer the following questions (ANY FOUR)
i) What is free fall?
ii) What is acceleration due to gravity?
iii) Write the SI unit for acceleration due to gravity (g)
iv) Calculate the value of acceleration due to gravity (g) at the centre of earth
v) What would be the value of ‘g’ when a coin and a piece of paper fall from
the same height and at the same time?
Answers
Answer:
1. In Newtonian physics, free fall is defined as the motion of an object where gravity is the only force acting upon it. ... A skydiver may be pulled towards earth by gravity, but they are also affected by air resistance, a force opposing their downward movement.
2. the acceleration of a body in free fall under the influence of earth's gravity expressed as the rate of increase of velocity per unit of time and assigned the standard value of 980.665 centimeters per second per second
3. The gravity of Earth, which is denoted by g, refers to the acceleration that the Earth imparts to objects on or near its surface. In SI units this acceleration is measured in metres per second squared (in symbols, m/s2) or equivalently in newtons per kilogram (N/kg).
5.. The coin reaches the ground first as compared to the piece of paper because it experiences lesser resistance from air than that felt by paper.
If the coin and the piece of paper are dropped in vacuum, both of them will touch the ground at the same time.
Explanation:
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1) downward movement under the force it gravity only
2) the gravity of earth, denoted by g , is the net acceleration that is imparted to object due to the combined effect of gravitation and the centrifugal force
3)g= 9.81m/s²