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Understanding Newton's Laws of Motion: First and Second Laws Explained

This lecture covers Newton’s First and Second Laws of Motion, focusing on object behavior when net forces are zero and the relationship between force, mass, and acceleration. The First Law describes inertia, illustrating that objects remain at rest or in uniform motion unless acted upon by a net force. Real-world examples, like a book on a table and a moving car, demonstrate this principle. The Second Law quantifies acceleration based on net force and mass, providing calculations for a helicopter's acceleration in the context of applied forces.

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Understanding Newton's Laws of Motion: First and Second Laws Explained

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  1. NIS – PHYSICAL SCIENCE Lecture 10 Laws of Motion OzgurUnal

  2. FirstLaw of Motion Firstlaw of Newton describeshow an objectmoveswhenthe net force on theobject is zero. Accordingtothefirstlaw of motion, ifthe net forceacting on an object is zero, theobjectremains at rest, oriftheobject is moving, it continuesmoving in a straightlinewithconstantspeed. • Examples: • Book on a table • A car moving at constant • velocity

  3. InertiaandMass • Inertia is thetendency of an objecttoresist a change in itsmotion. • Anythingthat has mass has also an inertia. Massincreasesinertia. Checkthisout! Whydoestheobject on the cart keepmoving? • Whathappenswhen I securetheobject on the car by a tape? • Whathappens in a car crash? • Why is it importanttousesafetybelts? • www.youtube.com/watch?v=rsqE-uOtMM4

  4. SecondLaw of Motion • Iftheball is heavy (moremass), is it easierorhardertothrow it withgreateracceleration? Imagineyourselfthrowing a ball. Ifyouthrowtheballwith a greaterforce, will it acceleratemoreorless? • Newton’ssecondlaw of motionrelatestheforce on an objecttoitsaccelerationandmass.

  5. NIS – PHYSICAL SCIENCE Lecture 11 SecondLaw of Motion OzgurUnal

  6. SecondLaw of Motion Newton’ssecondlaw of motionstatesthattheacceleration of an object is in thesamedirection as the net force on theobjectandthattheacceleration can be calculatedfromthefollowingequation: a = Fnet / m • Fnet = m * a • What is theunit of force?

  7. SecondLaw of Motion • Knownvalues: • Mass of thehelicopter: m = 4,500 kg • Netforce on thehelicopter: Fnet = 18,000 N • Unknownvalue: • Acceleration: a = ? • a = Fnet / m = 18,000 N / 4,500 kg = 4 m/s2 Ifthemass of a helicopter is 4,500 kg, andthe net force on it is 18,000 N, what is thehelicopter’sacceleration?

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