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    Laws of Motion
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    Why buffers are provided between the bogies of a train?
    Buffers are provided between the bogies of a railway train to avoid the severe jerk to bogies and to the passengers sitting in them.

    Buffers increase the time of impact between the two bogies before they stop and hence jerk is reduced. 
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    Are impulse and momentum similar type of quantities?
    Impulse and momentum are different types of quantities.

    Impulse is measure of the change in the momentum when an external force is applied while momentum is measure of the quantity of motion contained in the body. 
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    Why automobiles are provided with springs?
    Automobiles are provided with spring system because when an automobile moves on uneven roads, it receives a jerk. Spring system increases the time of impact and hence reduces the jerk and minimises the damages. 
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    Define impulse. Derive an expression for impulse in terms of momentum.

    Impulse is measure of the total effect produced by force. The force acting on the body changes the momentum of the body. Therefore, impulse of force is defined as the change in momentum produced by the force and is equal to the product of force and time for which force acts.
    Impulse is measure of the total effect produced by force. The force a
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    Why are chinawares wrapped in paper cutting or straw?
    China and glasswares are wrapped in paper or straw pieces before packing.  In the event of fall, impact will take a longer time to reach the glass/chinawares through paper or straw. As a result the average force exerted on the china or glassware is small and chances of their breaking reduces. 
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