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For Freely Falling Object We Can Write the Newton’S Second Equation of Motion as ….. - Science and Technology 1

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प्रश्न

For freely falling object we can write the Newton’s second equation of motion as …..

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उत्तर

`s =1/2 g t ^2`. 

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2018-2019 (March) Balbharati Model Question Paper Set 3

संबंधित प्रश्न

Explain why, if a stone held in our hand is released, it falls towards the earth.


What do you understand by the term 'acceleration due to gravity of earth' ?


The values of g at six distances A, B, C, D, E and F from the surface of the earth are found to be 3.08 m/s2, 9.23 m/s2, 0.57 m/s2, 7.34 m/s2, 0.30 m/s2 and 1.49 m/s2, respectively.
(a) Arrange these values of g according to the increasing distances from the surface of the earth (keeping the value of g nearest to the surface of the earth first)
(b) If the value of distance F be 10000 km from the surface of the earth, state whether this distance is deep . inside the earth or high up in the sky. Give reason for your answer.


Why does a sharp knife cut objects more effectively than a blunt knife ?


Explain why, a wide steel belt is provided over the wheels of an army tank.


Explain why, the tip of a sewing needle is sharp.


Name the force which stops you falling through the floor.


A stone is thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Show that the time taken to go up is the same as the time taken to come down.


An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? How long will the object take to come back to the earth? Assume g = 10 m/s


Solve the problem.

If the mass of a planet is eight times the mass of the Earth and its radius is twice the radius of the Earth, what will be the escape velocity for that planet?


i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest? 


The value of acceleration due to gravity of earth :


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?

  1. The horizontal applied force
  2. gravitational force
  3. reaction force in vertical direction
  4. force of friction  

The total energy of an object falling freely towards the ground ______.


A force acts for 0.1 s on a body of mass 2.0 kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2 m s-1. Find the magnitude of the force. 


A body falls freely under gravity from rest and reaches the ground in time t. Write the expression for the height fallen by the body.


State whether the below statement is True or False.
Neglecting air resistance, a body falling freely near the earth's surface has a constant acceleration.


The mass of planet ‘X” is four times that of the earth and its radius is double the radius of the earth. The escape velocity of a body from the earth is 11.2 × 103 m/s. Find the escape velocity of a body from the planet 'X’. 


The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is 1/6th of that on the 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)


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