Elasticity, Pressure, Gravitational Force
ELASTICITY
Ability of a body to return to its original shape is called
Ans: Elasticity
Hierarchy of elasticity
Ans: Steel > Rubber
PRESSURE
The force per unit area is called
Ans: Pressure
Pressure = Force/Area
The SI Unit of pressure = Pascal or N/m2
Unit of thrust
Ans : Newton
CGS unit
Ans : dyne /cm2
Force acts more on objects having
Ans : Low Surface area
ATMOSPHERIC PRESSURE
Atmospheric pressure = 760mm of Mercury
Unit of Atmospheric pressure
Ans : Bar
1 bar = 10^5 pascal
Pressure at sea level is taken as the
Ans : Standard Atmospheric Pressure
Barometer is used to calculate
Ans : Atmospheric Pressure
The liquid used in Barometer
Ans : Mercury
BAROMETER
Liquid Level change Indication
Rising-Calm climate
Sudden fall-Storm
GRAVITATIONAL FORCE
The mutual attractive force between two point masses m1 and m2, is inversely propotional to the square of the distance between them
Ans : Newton's law of Gravitation
Fa^m1m2/d2 ->F=G^m1m2/d2
g -> gravitational constant
Force of attraction between any two bodies in the universe is called
Ans : Gravitation
Law of gravitation was discovered by
Ans : Sir Isaac Newton
Weakest force in nature
Ans : Gravitational Force
The force keeps the earth and other planetary objects in their orbits around the sun
Ans : Gravitational Force
The acceleration with which the freely falling bodies are attracted towards the earth is called the
Ans : Acceleration due to gravity (g) g = 9.8m/s2 (32.2 feet/s2)
Weight of freely falling body
Ans : Zero
VALUE OF'G' IS
Maximum at Polar regtons
Minimum at Equatorial regions
Zero at the center of the earth
Universal Law of Gravitation was put forward by
Ans : Sir Isaac Newton
The 'g' is maximum on Jupiter and minimum on the planet
Ans : Mercury
Astronaut cannot drink lemonade with the help of a straw because
Ans : There is no atmosphere on the moon
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