Physics Laws of Motion Exercise3e
Please Select
Q1 State Newton’s law of gravitation.
Q2 State whether the gravitational force between two masses is attractive or repulsive?
Q3 Write an expression for the gravitational force of attraction between two bodies of masses m1 and m2 separated by a distance r.
Q4 How does the gravitational force of attraction between two masses depend on the distance between them?
Q5 How is the gravitational force between two masses affected if the separation between them is doubled?
Q6 Define gravitational constant G.
Q7 Write the numerical value of gravitational constant G with its S.I unit.
Q8 What is the importance of the law of gravitation?
Q9 What do you understand by the term force due to gravity?
Q10 Write an expression for the force due to gravity on a body of mass m and explain the meaning of the symbols used in it.
Q11 Define the term acceleration due to gravity? Write its S.I. unit
Q12 Write down the average value of g on the earth’s surface.
Q13 . How is the acceleration due to gravity on the surface of the earth related to its mass and radius?
Q14 How are g and G related?
Q15 A body falls freely under gravity from rest and reaches the ground in time t. Write an expression for the height fallen by the body.
Q16 Distinguish between average speed and average velocity.
Q17 . Define the terms mass and weight.
Q18 Distinguish between mass and weight.
Q19 State the S.I. units of (a) mass and (b) weight
Q20 The value of g at the center of the earth is zero. What will be the weight of a body of mass m kg at the center of the earth?
Q21 Which of the following quantity does not change by change of place of a body: mass or weight?
Q22 Explain the meaning of the following statement ‘1kgf=9.8N’.
Multiple Choice type Questions :
Q1 The gravitational force between two bodies is:
(a) Always repulsive
(b) Always attractive
(c) Attractive only at large distances
(d) Repulsive only at large distances
Q2 The value of G is
(a) 9.8N m2 kg-2
(b) 6.7 x 10-11 Nm2kg-2
(c) 6.7 x 10-11 ms-2
(d) 6.7 Nkg-1
Q3 The force of attraction between two masses each of 1kg kept at a separation of 1m is:
(a) 9.8N
(b) 6.7N
(c) 980N
(d) 6.7 x 10-11 N
Q4 A body is projected vertically upward with an initial velocity u. If acceleration due to gravity is g, the time for which it remains in air, is:
(a) u/g
(b) ug
(c) 2u/g
(d) u/2g
Q5 An object falling freely from rest reaches ground in 2s. if acceleration due to gravity is 9.8 m/s2 , the velocity of the object on reaching the ground will be:
(a) 9.8m/s
(b) 4.9 m/s
(c)19.6m/s
(d) Zero
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