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Newton's First Law of Motion

Khan Academy



Khan Academy

Introduction to newton’s first law of motion. Inertial frames of reference.

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45 thoughts on “Newton's First Law of Motion”

  5. I see a strong correlation between Hegelian's Dialectics; Thesis-Antithesis-Synthesis, and Newtons Laws of Motion. Antithesis is the contrast or opposition of an idea or concept, and synthesis is the unified whole of mutually exclusive elements, or the reconciliation of contradictory ideas where a new idea is formed, and this concept has been perfectly demonstrated within the medical context. Our perception of the world is constructed around polar opposites, a notion demonstrated in Issac Newton's Three Laws of Motion, a law in nature that laid the foundation for classical mechanics.

    Primarily the "Third Law" which states; every force or action is contingent on an equal reactive force. Meaning if you push a cup on a table, it's motion and velocity should be perpetual, but what hinders or constricts is movement is an external force; like the friction on the table applied contrastingly to the cup in motion, hence it stops. Or the "First Law" which states; an object in uniform motion stays in motion unless acted upon by any given force.

  8. I have an idiotic question but someone please refresh my mind

    If you apply a constant force of 10N to a mass of 1kg, it will accelerate 10m/s^2 until the application of the force ceases, in which case the velocity of the mass will be whatever it was when the force stopped being applied. 

    Now to the question. If you bench press for instance (a small weight that you can do pretty much whatever you want to) you're applying a force to the weighted bar, right? However, the weight is not necessarily accelerating. Say you intentionally press the bar from your chest all the way up with a constant velocity (ofc t(0) won't be the same as after 2 seconds but anyway) of 0,2 m/s, what is the catch in that situation? A force must be applied constantly or the weight would drop on your chest, why isn't it accelerating?

    thanks a lot for answers!

  10. hey, can u explain how the pair of dice move backwards, when the car accelerates forward, isnt the dice supposed to go in the same direction of the acceleration of the 'pickup truck'??

  20. hey this video is basically the law of linear inertia. everything gets crasy when you talk about rotational inertia and the angular counterpart of mass. A video on rotational inertia would be greatly appreciated!

  23. @mdias5907699 I hadn't learnt of calculus yet when I posted this, since posting I discovered the reason why, but thanks anyway. The fault lies with those who promote the following incorrect statements: v=d/t a=v/t
    Are these usually taught at university undergraduate level?

  27. hey men this mass is in the line of zero,and all started from zero,unit or gravity is zero,so when the mass is at rest it will stay atrest,when you spin it it will stays in motion,at the line of zero

  29. thank you so much! you're very good at explaining this, i will definitely be looking towards your other videos for physics help.

  32. When your in a vehicle, the dice doesnt move for the outside viewer, it stays stationary, while the car moves. same if you put a book on the dashboard, and take a sharp turn, it appears to slide sideways to the people in the car, but from the frame of outside the car, the book isnt moving, it simply stays stationary, while the car moves

  35. kindda confused me.. i guess all i needed to know was that it stays in motion or stay at rest unless acted upon by an external force.. the inertia bit I dont get and confused me since I don't know what it means.. :/

  39. his voice charms me, before i go to sleep i open my laptop then watch this videos because his voice are so charming……uhhhhh

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