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Question
Why is a person falling on a cemented floor injured, while a person falling on a heap of sand is not?
Why is a person falling on a cemented floor injured, while a person falling on a heap of sand is not?
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Solution
The correct option is B Reduces the impact of impulsive force.
Impulse is defined as the rate of change of momentum also It is expressed as the product of impulsive force and time
In case of a person falling on the cemented floor, the reaction time is less hence the impulsive force is large The cemented floor being a solid and compact material does not deform on collision hence for the momentum change to occur after collision large force is applied for small interval hence increasing the impact of impulsive forcewhile on the other hand person falling on a heap of sand reaction time is more thus the impulsive force is lessParticles in case of heap of sand are not intact and are deformed on collision resulting in increase in reaction time and as impulsive force is inversely proportional to time the impact of impulsive force is reduced
Impulse is defined as the rate of change of momentum also It is expressed as the product of impulsive force and time
In case of a person falling on the cemented floor, the reaction time is less hence the impulsive force is large
The cemented floor being a solid and compact material does not deform on collision hence for the momentum change to occur after collision large force is applied for small interval hence increasing the impact of impulsive force
while on the other hand person falling on a heap of sand reaction time is more thus the impulsive force is less
Particles in case of heap of sand are not intact and are deformed on collision resulting in increase in reaction time and as impulsive force is inversely proportional to time the impact of impulsive force is reduced
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