Define momentum and state its $SI$ unit. State the principle of conservation of momentum.
(N/A) Momentum is defined as the product of the mass of a body and its velocity. It is also known as the quantity of motion contained in a body. Its $SI$ unit is $kg \cdot m \cdot s^{-1}$.
The principle of conservation of momentum states that if no external force acts on a system, the total momentum of the system remains conserved (constant).
The principle of conservation of momentum states that if no external force acts on a system, the total momentum of the system remains conserved (constant).
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$(a)$ $(i)$ Define momentum. State its $SI$ unit.
$(ii)$ An object of mass $50 \ kg$ is accelerated uniformly from a velocity of $4 \ m/s$ to $8 \ m/s$ in $8 \ s$. Find the magnitude of the force exerted on the object.
$(b)$ State Newton's first law of motion.
$(ii)$ An object of mass $50 \ kg$ is accelerated uniformly from a velocity of $4 \ m/s$ to $8 \ m/s$ in $8 \ s$. Find the magnitude of the force exerted on the object.
$(b)$ State Newton's first law of motion.
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$(b)$ It is dangerous to jump out of a moving bus.
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$(a)$ All cars are provided with seat belts.
$(b)$ It is dangerous to jump out of a moving bus.
$(c)$ Road accidents at high speeds are much worse than accidents at low speeds.
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View SolutionIn which direction do the following forces act when an object is in motion?
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$(ii)$ Gravitational force
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$(i)$ Frictional force
$(ii)$ Gravitational force
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$(i)$ Why do we jerk wet clothes before spreading them on a line?
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$(iii)$ Why do fruits fall off the branches in a strong wind?
$(iv)$ Why does a pillion rider fall forward when the driver of a two-wheeler suddenly applies brakes?
$(i)$ Why do we jerk wet clothes before spreading them on a line?
$(ii)$ Why does dust fly off when a carpet is hit with a stick?
$(iii)$ Why do fruits fall off the branches in a strong wind?
$(iv)$ Why does a pillion rider fall forward when the driver of a two-wheeler suddenly applies brakes?
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