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प्रश्न
Write a short note.
Free Fall
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उत्तर
- The motion of any object under the influence of the force of gravity alone is called free fall.
- In free fall, the initial velocity of the object is zero and goes on increasing due to the acceleration due to gravity of the earth.
- During free fall, the frictional force due to air opposes the motion of the object and a buoyant force also acts on the object.
- Thus, true free fall is possible only in a vacuum.
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संबंधित प्रश्न
A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity just before touching the ground.
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 m/s2, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.
What is the acceleration produced in a freely falling body of mass 10 kg ? (Neglect air resistance)
Fill in the following blank with suitable word :
The acceleration due to gravity on the moon is about ………………of that on the earth.
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Name the force which pulled the apple off Isaac Newton’s tree.
Name the force which stops you falling through the floor.
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Solve the problem.
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Choose one or more correct alternatives.
Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude?
- The horizontal applied force
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- reaction force in vertical direction
- force of friction
A force of 15 N acts on a body of mass 2 kg. Calculate the acceleration produced.
A body is projected vertically upward with an initial velocity u . If acceleartion due to gravity is g , the time for which it remains in air , is :
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Write scientific reason.
The value of gravitational acceleration (g) decreases as we go deep inside the earth.
Distinguish between:
Universal gravitational constant - Gravitational acceleration of earth.
Calculate the escape velocity on the surface of the moon given the mass and radius of the moon to be 7.34 × 1022 kg and 1.74 × 106 m respectively.
(Given: G = 6.67 × 10-11 Nm2/kg2)
