Samacheer Kalvi - English Medium Classes
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Laws of Motion Flash Cards
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Samacheer Kalvi - English Medium
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26 cards in this set.
Inertia of a body depends on
c) mass of the object
Impulse is equals to
c) change of momentum
Newtons III law is applicable
c) both a & b
Plotting a graph for momentum on theX-axis and time on Y-axis. slope of momentum-time graph gives
In which of the following sport the turningof effect of force used
The unit of g is m s-2. It can be also expressed as
b) N kg-1
One kilogram force equals to
c) 98*10^4 dyne
The mass of a body is measured on planetEarth as M kg. When it is taken to a planetof radius half that of the Earth then its valuewill be____kg
If the Earth shrinks to 50% of its real radiusits mass remaining the same, the weight of abody on the Earth will
d) increase by 300%
To project the rockets which of the following principle(s) is /(are) required?
d) both a and c
To produce a displacement ___________is required
Passengers lean forward when suddenbrake is applied in a moving vehicle. Thiscan be explained by ___________
inertia of motion/ Newton's first law
By convention, the clockwise momentsare taken as ___________ and theanticlockwise moments are takenas__________
___________ is used to change the speedof car.
A man of mass 100 kg has a weight of___________ at the surface of the Earth
Newtons I law
Stable equilibrium of a body
Newtons II law
Law of force
Newtons III law
Flying nature of bird
Law of conservationof Linear momentum
propulsion of a rocket
The linear momentum of a system ofparticles is always conserved.
FALSE (The linear momentum of a system of particles is conserved when no external force is applied)
Apparent weight of a person is always equalto his actual weight
FALSE ( Apparent weight of a person is equal to his actual weight when he/lift is at rest and It varies depending on the movement of the lift)
Weight of a body is greater at the equatorand less at the polar region.
FALSE (Weight of a body is lesser at the equator and greater at the polar region)
Turning a nut with a spanner having ashort handle is so easy than one with a longhandle.
FALSE (Turning a nut with a spanner having a long handle is so easy than one with a short handle .)
There is no gravity in the orbiting spacestation around the Earth. So the astronautsfeel weightlessness.
FALSE (Astronauts and orbiting space station are under free fall condition with same acceleration, so the astronauts feel weightlessness)
(A): The sum of the clockwisemoments is equal to the sum of theanticlockwise moments.. (R): The principle of conservation ofmomentum is valid if the external force onthe system is zero.
(b) Both the assertion and the reason aretrue, but the reason is not the correct explanation of the assertion.
(A): The value of g decreases asheight and depth increases from the surfaceof the Earth.. (R): g depends on the mass of theobject and the Earth.
(c) Assertion is true, but the reason is false.
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