Q1
What does Newton's First Law state?
AObjects stay at rest or in motion unless a force acts
BForce equals mass times acceleration
CEvery action has an equal reaction
DNone of these
ICSEClass 9 (ICSE)PhysicsCh 3 · Topic 2
Practice and Revision - Laws of Motion
Let us practise and revise what we learned about laws of motion. Newton's three laws of motion describe how forces affect the motion of obje
Core concept
Newton's First Law states that an object remains at rest or in uniform motion unless acted upon by an external force (law of inertia).
How it works
Newton's Second Law states that force equals mass times acceleration (F=ma), showing how force affects an object's motion.
Why it matters
Newton's Third Law states that for every action, there is an equal and opposite reaction, explaining forces between interacting objects.
Key detail
These laws explain everyday phenomena, like why we feel pushed back in an accelerating car, or how rockets propel themselves forward.
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Quick notes
• First Law: objects stay at rest or in motion unless a force acts (inertia).
• Second Law: Force = mass × acceleration (F=ma).
• Third Law: every action has an equal, opposite reaction.
• These are Newton's three laws of motion.
• They form the foundation of classical mechanics.
• They explain everyday phenomena.
• Example: feeling pushed back in an accelerating car.
• Example: rockets propelling forward using reaction force.