Short Note
An object has mass of 20 kg on earth. What will be its (1) mass, and (2) weight, on the moon ? (g on moon = 1.6 m/s2).
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Solution
(i) Mass on moon = 20 kg (mass remains constant everywhere)
(ii) W (Weight of the object on moon) = ?
m (mass of the object) = 20kg
g (acceleration due
to gravity on moon)= 1.6 m/s2
W= mg
= 20×1.6
= 32 N
Answer: Weight on moon = 32N
Concept: Mass and Weight of an Object
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Chapter 3: Gravitation - Very Short Answers 1 [Page 102]
Q 47Q 46Q 48
APPEARS IN
Lakhmir Singh Science Class 9 Physics
Chapter 3 Gravitation
Very Short Answers 1 | Q 47 |
Page 102
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Video Tutorials For All Subjects- Mass and Weight of an Object
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As given, the mass of the object on the earth $m_e=20\ kg$
Gravitational acceleration on the moon $g=1.6\ m/s^2$
(i). As known, the mass of an object remains constant. Therefore, the mass of the object on the moon will be $20\ kg$.
(ii). Weight of the object on the moon $W_m=mg$
$=20\ kg\times1.6\ m/s^2$
$=32\ N$
Therefore, the weight of the object on the moon is $32\ m/s^2$.
#F_G~~196" N"# (downward)
Explanation:
The equation for the force of gravity acting on a stationary object at or near the surface of the earth is given by:
#F_G=mg#
We have the following information:
- #|->m=20" kg"#
- #|->g=9.81" m"//"s"^2#
Therefore:
#F_G=(20" kg")(9.81" m"//"s"^2)#
#=196.2" N"#
#~~color(darkblue)(196" N")# (downward)