# Newton's law of gravitation. Practice questions

Force (WORKout questions.)

1.        What is free fall?

2.        What is gravity?

3.        What is the value of “g” at the center of Jupiter? Why?

4.        What is the value of universal graivitational constant?

5.        Acceleration due to gravity is 9.8m/s2. Write any two infomations can be obtained from the statement. Or what do you mean by these statements?

6.        What is gravitational constant? WRITE it’s SI unit.

7.        Write the value of g in the equator and                     polar region.

8.        What is the relationship between acceleration due to gravity and radius of heavenly object

9.        What is acceleration due to gravity?

10.     What is the value of acceleration due to gravity at the SURFACE OF THE MOON?

11.     Write the formula to calculate the weight of an object.

12.     What is gravitational force?

13.     In what condition acceleration due to gravity on parachute is zero?

14.     State newton’s law of gravitation.

15.     Do you think gravitational force between sun and earth is affected by the gravity of other planets?

16.     What is the value of acceleration due to gravity on the surface of the Jupiter?

17.     Write two condition in which the weight  of an object is zero?

18.     Write the value of the universational gravitational constant? What do you mean by this value?

19.     Under what  condition universal gravitational constant becomes equal to the                                               gravitational             force?

20.     Out of solid and liquid which has more force of gravitation?

21.     When a coin and feather are dropped together, will they reach to the ground at the same time?

22.       What is the conclusion of the coin and feather experiment?

23.      What is weightlessness?

24.     Why do the satellite does not fall to the ground?

Or, Why satellite does not require fuel to revolve around earth?

25.     AT what condition coin and feather fall together?

26.     Write down the effect of gravity of     sun and moon on ocean and sea?

27.     In which direction the force of gravity act?

28.     Where does the force of gravity is maximum on  earth?

29.     What are the factors that affect the f orce of gravitation?

30.     What is the effect of the gravity on falline object?

31.     In formula g = GM/R2, what does g, G,M and R mean?

32.     What is geocentric theory?

33.     What is heliocentric theory?

34.     What is force? Write its si unit.

35.     Write the relationship between gravitational force with mass and distance between the center of objedccts.

36.     What will be the gravity of the earth                          if it is compressed to the size of the moon?

37.     In what direction gravitational force works?

38.     By what force planets revolve around massive objects?

39.     State newton’s law of gravitation and derive its mathematical expression.

40.     What is the name  given to the force      between            earth and the object on the earth?

41.     Who was the first person to calculate the value  of  G correctly?

42.     Mention any two factors that affect the gravity.

43.     Give an example of gravity.

44.     Write any two affects of gravity.

45.     Does the gravity of the earth affect a body in space?

46.     Write the relationship between gravity with mass and radius of the planet. Derive mathematical relationship as well.

47.     What is mass of an object? What is its SI unit?

48.     Which instrument is used for measuring the mass of a body?

49.     Mention any two factors on which mass of an object depends.

50.     What is weight? What is its SI unit?

51.     By what instrument is the weight of a body is measured?

52.     Mention any two factors on which the weight of a body depends.

53.     Compare the weight of an object on the earth and on the moon.

54.     The bodies in the universe attract each other by virtue of their mass. Who was the scientist propounded this theory?

55.     What is the relation between weight and acceleration due to gravity?

56.     What are the factors that affect acceleration due to gravity.

57.     What will happen to the acceleration due to gravity if radius of the earth is decreased.

58.     What are the factors that affect the acceleration due to gravity in the earth.

59.     What is the affect of altitude in acceleration due to gravity.  Give one example.

60.     How the value of g changes from polar to equatorial region?

61.     Write the relation between g and G.

62.     The acceleration due to gravity of Jupiter is 25m/s2. What does that mean?

63.     What force produces acceleration due to gravity on the earth?

64.     What is the weight of any object on the center of the earth?

65.     What is the weight of the  body during free fall?

66.     If you measure your own weight, where you will find maximum and minimum weight in Nepal? Explain.

67.     Weight of Ram is 60 Kg. Is this statement correct? Explain.

68.     Explain the difference between fall of parachute in earth and moon.

69.     In which condition, acceletarion due to gravity of parachute is zero.

70.     What is the weightlessness in space?

71.     What is meant by null points?

72.     What is gravitational fiend intensity?

73.     What is Robert Boyle’s view of free fall?

74.     What is orbital velocity?

75.     Define excape velocity.

76.     Write any two difference between mass and weigt.

77.     Mass is constant but weight is variable. Why?

78.     By how many times the weight of a body less on the surface of moon than on the surface of the earth?

79.     Kathmandu lies at more altitude than Biratnagar. How it will affect acceleration due to gravity and weight of a body?

80.     A man travels from Hilly region to Terai region. What will happen to his weight?

81.     Illustrate that g is inversely proportional to the square of the distance from the center.

82.     Write the difference between gravity and acceleration due to gravity.

83.     Why the weight of a body is different in different celestial objects?

84.     What will be the mass of a object if it has mass 2 kg on earth’s surface?

85.     Astronaut feel weightlessness in space. Why?

86.     Two stones, one with 20 kg mass and another with 5 kg mass are dropped together. Which one will hit the ground first? Why?

87.     Why atmosphere doesnot escape from earth?

88.     Why iron ball and feather fall together in vacuum?

89.     Differentiate between free fall and weightlessness.

90.     Tides rise on sea but not on our Bucket. Why?

91.     A stone and paper are dropped on the surface of the moon . What will happen ? Explain.

92.     A loose paper falls slowly than crumpled one. Why?

93.     Why do all planets revolve around the sun?

94.     What happen to the gravitational force between two objects if

i.                     Mass of the both object is doubled.

ii.                    Mass of one object is doubled.

iii.                  Mass of one object is halved.

iv.                   Distance is reduced to half.

v.                    Distance is doubled.

95.     Why is the newton’s law called universal law?

96.     We don’t see our friends being pulled by another friend by virtue of gravitational force only. Explain the reason.

97.     Why heavier objects do not fall quickly to the surface of the earth?

98.     Two star has mass X and Y and a is the distance between them. What is the gravitational force between them?

99.     Why Gravitational force between any two object in our evberyday’s experience is not noticed?

100.  Although apple and earth both attract each other, why earth does not move toward apple?

101.  If sun’s size is doubled the  mass. What would be the resultant force to the earth from the sun?

102.  How the acceleration due to gravity changes when we go toward the center of the earth? Why the value of g at the center?

103.  Mass of object can’t be measured in space. Why?

104.  Why the change in velocity is observed when we throw a object upward?

105.  You can jump more on the surface of the moon. Why?

106.  Object dropped in pole reaches to the surface than the object dropped from the equator. Why?

107.  Mass is measured by beam balance but weight is measured by spring banalce. Why?

108.  A small hole is made on a cup and water is filled and cup is allowed to fall freely. Will the water sip from the hole? Why?

109.  Why do we feel uncomfortable when we move downward in giant wheel?

110.  Why G is scalar quantity but g is a vector quantity?

111.  Explain about coin and feather experiment.