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Physics – Mechanics: The Pulley (1 of 2)

Michel van Biezen



Michel van Biezen

Visit http://ilectureonline.com for more math and science lectures!

This lecture series will cover Newton’s Second Law of Physics: F=ma.

This lecture series will introduce you to the function of a pulley, also called the Atwood Machine.

Problem Text:
A string is placed over a massless and frictionless pulley. A mass of 8kg is suspended at one end while a mass of 5kg is suspended from the other. What is the acceleration of the system.

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42 thoughts on “Physics – Mechanics: The Pulley (1 of 2)”

  1. Let us say I'm making a 2:1 ratio pulley system. 1st mapping is: (A) 10kg weight on ground rope tied to it, (B) Pulley anchored on ceiling, and (D) I am hand pulling from free end on ground over top pulley to move (A) to a balanced point and progress capture. Here I get 10kg to move, 20kg on pulley anchor, while I tugged at 10kg. Correct? OK… Map 2: What if I add another identical size pulley hanging same height @ 60cm away… then run atop both pulleys still in a 2:1 (no direction change). Even if angle of the two pulleys is more or less out of the equation… Am I reducing friction? Does this have potential for preventing potential vectoring or twist of my tugging position? Did I make any difference like changing acceleration or ease I might feel by possibly sort of creating a larger bullwheel so there is less bite over just atop the single pulley? I know that is a lot to ask. Thank you for considering my inquiries.

  4. A very interesting lecture. My question:
    How would you explain this by the old system? Since you only examine a static condition, the forces in the rope’ s sides while the pulley is not rotating.
    I spent 60 years in static engineering and I am glad that I got out of it in the right time. One of my daughter is a physicist from Cambridge.

  10. I need to have the car not a board. I taught my son how to test and repair motors from the 80's through to the 90's but now doing an apprenticeship he has to learn all this. I pity him because to me it makes no sense.

  15. wow man thank you so much for your physics series. i had a mental breakdown thinking i would have to switch majors because of this class and you really helped me through this. you should make a patreon so i can pay you my tuition instead lol, thanks again!!!

  17. i have one doubt . Here its said that tension in the string is same in both side of the pulley .but a pulley will be in static equilibrium if the tension is equal on both sides as turning effect clockwise and anticlockwise cancels out the rotation chance . here in this question the pulley will rotate anyway . so how we can say tension in the string is same on both sides ?plz help

  27. I wish my professor would teach these concepts straightforward like Biezan, he does it in like 10min too. My professor just explains how the equations are derived and has us do practice questions as HW, without actually doing at least one problem to show us how its done. Going though step by step of how to solve physics questions in these videos helps me understand more and gives me hope to pass my physics class

  33. Michael can you explain to me simply why tensions in the cable are equal please? My understanding is that theres no friction in the pulley, therefore the friction forces will not exert their forces on the cables on either side therefore they wouldn't be separate tensions. There are different masses on each side and therefore there would be different frictions and different tensions.

  34. Michael how is tension an external force on the system? If we look at the whole system then surely it would count the cables tension as an internal force?

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