sci_phy
Momentum and Conservation
Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.
Free online summary and notes (ICSE Class 10 Hindi). Read it here, no PDF download needed.
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Physics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)
Summary
It measures how much motion a body carries. A slow truck can match a fast car if their m × v are equal.
This follows from Newton's third law: the equal and opposite forces act for the same time, so the momentum changes cancel.
If objects stick together it is perfectly inelastic and the most kinetic energy is lost to heat and sound.
Airbags, crumple zones and bending your knees on landing all stretch the time to cut the peak force.
Hard words & meanings
| momentum | the product of an object's mass and velocity; a vector, unit kg m/s |
| velocity | speed in a stated direction; a vector quantity |
| vector | a quantity that has both size and direction |
| closed system | a system with no external (outside) forces acting on it |
| impulse | force multiplied by the time it acts; equals the change in momentum |
| elastic collision | a collision in which both momentum and kinetic energy are conserved |
| inelastic collision | a collision in which momentum is conserved but kinetic energy is not |
| recoil | the backward motion of a body when it fires or expels another, to keep total momentum zero |
Model exam answers, grammar & audio
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