sci_phy
Gravity and Weight
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
Mass is measured in kilograms and never changes. Weight is a force in newtons and changes with the planet you stand on.
On Earth g is about 9.8 N/kg, so a 60 kg person weighs about 588 N. Weight always points straight down.
Moon g is about 1.6 N/kg, roughly one sixth of Earth's. Mass stays the same, only weight changes.
Near Earth this is about 9.8 m/s², regardless of mass. A feather and a hammer fall together if there is no air.
Hard words & meanings
| gravity | the attractive force that acts between any two objects that have mass |
| mass | the amount of matter in an object, measured in kilograms; it does not change with location |
| weight | the force of gravity acting on an object's mass, measured in newtons |
| gravitational field strength | the force of gravity per kilogram of mass, symbol g, in N/kg |
| newton | the SI unit of force, symbol N |
| free fall | motion when the only force acting on an object is gravity |
| weightless | feeling no support force, as in continuous free fall during orbit |
| acceleration | the rate at which velocity changes; in free fall it equals g |
Model exam answers, grammar & audio
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