Page 5 - Simplied Force

SIMPLIFIED COURSE ON SEE SCIENCE : CHAPTER- FORCE

Paratrooper

➢ In Freefall =

➢ Air Resistance <

➢ More Air Resistance (Drag) ≪<

➢ When a paratrooper jumps from a height, he freefalls; but when he opens his parachute, the air
resistance acts upwards. When the air resistance and the weight of paratrooper are equal, the
acceleration of the paratrooper becomes Zero and the paratrooper falls with a uniform
velocity.

Differences between g and G

g G

It is the acceleration produced on the body It is the force of attraction between two
due to gravity unit masses separated by 1m distance
Its unit is m/s2 Its unit is Nm2/kg2
It is a vector quantity It is a scalar quantity
Its value changes from place to place. It is universal and is fixed

Differences between Gravitation and Gravity

Gravitation Gravity
It is universal force It is not universal

It occurs between any two For this one body must always be a
bodies in the universe planet or a satellite

Differences between Mass and Weight

Mass Weight
It is the force by which a body is
It is the amount of substance attracted towards the center of the
contained in a body
earth
It is a constant quantity It varies from place to place
It is a scalar quantity It is a vector quantity
Its unit is Kg Its unit is N
It is measured by beam balance It is measured by spring balance

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