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CBSE Notes 2011-2012 » IX-Science

Force and Laws of Motion

Impulse has the S.I. unit of ________.

Multiple choice question

Impulse has the S.I. unit of ________.

A : Atheletes fall on a cushion in a high jump event to avoid getting hurt. B : Time to come to rest...

Multiple choice question

A : Atheletes fall on a cushion in a high jump event to avoid getting hurt.
B : Time to come to rest is increased to reduce the force.

A : Force can change the direction and magnitude of the velocity. B : Acceleration may be acquired d...

Multiple choice question

A : Force can change the direction and magnitude of the velocity.
B : Acceleration may be acquired due to the reduction in the mass of the body under motion.
C : Two masses moving with the same velocity can be stopped in distances S1 and S2 (< S1) such that m1 > m2 with the same retarding force.

A : The ratio of the S.I. to C.G.S. unit of forces is 105. B : Water evolving out of a hose exerts n...

Multiple choice question

A : The ratio of the S.I. to C.G.S. unit of forces is 105.
B : Water evolving out of a hose exerts no force on the pipe.

Two automobiles of mass 3000 kg and 5000 kg moving towards each other with velocities 25 m/s and 15 ...

Multiple choice question

Two automobiles of mass 3000 kg and 5000 kg moving towards each other with velocities 25 m/s and 15 m/s undergo collision. After collision the lighter one comes to a halt in 25 m distance. If the same retardation exists for the heavier also, the distance covered by it will be

In the previous question, if the same retarding force exists, the distance covered by the heavier wi...

Multiple choice question

In the previous question, if the same retarding force exists, the distance covered by the heavier will be

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