Newton's 2nd Law Problem: Three Blocks and 2 Strings

Physics Ninja looks at a Newton's 2nd law problem where 3 blocks are connected by 2 strings. Two of the blocks are suspended and one block slides on the table. There is friction between the block and the table.
I look at the free body diagrams and write down Newton's 2nd law for each block. I then solve for the acceleration of the blocks and the Tension in each string.

[@valleferrer8508]

You don’t know what a life saver you are. I love physics but my professor goes too fast… it frustrates me to the point of crying. and then i see your videos and I understand on the first try…. thank you.

[@PhysicsNinja]

You’ve got this!

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Just want to say thank you so much for your videos, because of you I was able to pass Physics.

[@PhysicsNinja]

You are most welcome

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I think you are my saving grace, im currently in physics 20 ang had no clue how to do this but after this I knew how to this!! I think I'll be able to pass this class!

[@PhysicsNinja]

You got this! Good luck

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[@Odenoyecaleb]

Wow
Physics Ninja you really break this down to my understanding 🤗
Am really happy to get here
And this is the first time of watching your video
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[@PhysicsNinja]

Glad it was helpful!

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Thanks

[@User-hz5vz]

thanks for the video sir .
Support from india

[@PhysicsNinja]

So nice of you

[@kalkidangete7875]

why we take the kinetic friction to the right ?why it isn't to the left ?

[@wanachipoya810]

Because friction acts in the opposite direction of acceleration

[@PhysicsNinja]

First solve it without friction. Friction is opposite of the motion. In this case to the right.

[@Ary2345]

It depends .....let's say the questions gives you scenario that object is moving to right.then you take UK to left cuz it's always opposite to motion just like normal friction.

[@SirThorp]

I have a problem that included values for both static and kinetic friction. How would I implement the static friction into the problem? Thank you.

[@haleyhyatt8490]

Why is T1 not equal to T2? I thought that tension along a cord is always constant/equal?

[@PhysicsNinja]

2 different strings

[@majwin-6794]

Quick question,
Why is the acceleration always assumed to be the same for all three bodies. I mean the other two mass are just hanging and have no friction, but block 2 is moving on a surface that has friction to oppose it's motion, so how does it have the same acceleration with the rest of the 2 masses

[@PhysicsNinja]

If the blocks have different accelerations it means they are getting closer together or farther part. Typically the length of the strings remains constant, if this is the case the accelerations but be the same.

[@majwin-6794]

@@PhysicsNinja
So it means the more friction on the second mass, the more the overall acceleration reduces. And when it's on a smooth surface, the acceleration (for all three) becomes greater?

[@PhysicsNinja]

@@majwin-6794 yes

[@majwin-6794]

@@PhysicsNinja thank you ❤️

[@hooberdoober576]

Use the Lagrangian. Easier. Faster. Unlike humans, Mother Nature wastes no efforts.

[@charlescowan6121]

This is the way!