Q1
What does Newton's First Law state?
AAn object stays at rest or motion unless forced
BForce equals mass times acceleration
CEvery action has an equal reaction
DNone of these
SSCClass 9 (SSC)Science and Technology (विज्ञान आणि तंत्रज्ञान)Ch 1 · Topic 1
Laws of Motion
Newton's three laws of motion describe the relationship between forces acting on an object and its resulting motion, fundamental to physics.
Core concept
Newton's First Law (inertia) states an object remains at rest or in uniform motion unless acted upon by an external force.
How it works
Newton's Second Law states force equals mass times acceleration (F=ma), relating the force applied to an object's resulting acceleration.
Why it matters
Newton's Third Law states that for every action, there is an equal and opposite reaction, explaining paired forces between interacting objects.
Key detail
These laws explain everyday phenomena, from why seatbelts are necessary to how rockets propel themselves through space.
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• First Law (inertia): object stays at rest/motion unless forced.
• Second Law: F=ma (force=mass×acceleration).
• Third Law: action has equal, opposite reaction.
• This explains paired interacting forces.
• Laws explain seatbelt necessity.
• Also explain rocket propulsion.
• These are fundamental physics principles.
• They apply to all motion in classical mechanics.