Block-on-Block attached by String to Block in Pulley on Incline

In summary, you attempted to find the X component of the force needed to accelerate Block B+C, but found it difficult to follow the same instructions as example 3 on the website. You should have calculated the X component of the force for Block B+C with the mass of just Block B.
  • #1
Keena
3
0
Hi all,

The problem is shown below - but no answer was given to this, and the teacher did not plan on taking it up, since it was optional extra practice.

My attempt at a solution: http://imgur.com/DmrgMMO, my final answer was 2.76 kg.

I was wondering if this was right or wrong, and if anyone could show me the proper steps.

Thanks for your time.
 

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  • #2
Keena said:
Hi all,

The problem is shown below - but no answer was given to this, and the teacher did not plan on taking it up, since it was optional extra practice.

My attempt at a solution: http://imgur.com/DmrgMMO, my final answer was 2.76 kg.

I was wondering if this was right or wrong, and if anyone could show me the proper steps.

Thanks for your time.

attachment.php?attachmentid=67978&d=1395711617.png


Your solution for the maximum acceleration of Block C looks fine.

I haven't gone through the rest of your solution, but with that, it should be pretty straight formard to fin the force necessary to accelerate Block B & C at that value.
...
 
  • #3
Ah, quick specific question, my calculation for the X component of the Fg for Block B+C, was done by adding up both masses.

But looking at example 3 here: http://www.physicsclassroom.com/class/newtlaws/Lesson-3/Double-Trouble

Should I have just calculated X component for Fg of Block B+C with just the mass of B?
 
  • #4
Keena said:
Ah, quick specific question, my calculation for the X component of the Fg for Block B+C, was done by adding up both masses.

But looking at example 3 here: http://www.physicsclassroom.com/class/newtlaws/Lesson-3/Double-Trouble

Should I have just calculated X component for Fg of Block B+C with just the mass of B?
Block C is stationary with respect to Block B, so you can threat them as a single object.
 
  • #5
Thanks very much.

Everything's clear to me now.
 

FAQ: Block-on-Block attached by String to Block in Pulley on Incline

What is a block-on-block attached by string to block in pulley on incline?

A block-on-block attached by string to block in pulley on incline is a physics experiment that involves a string attached to two blocks, one on a flat surface and the other on an inclined plane. The string runs through a pulley, connecting the two blocks and allowing for the transfer of force.

How does the pulley affect the experiment?

The pulley in this experiment allows for the transfer of force between the two blocks. It also changes the direction of the force, making it easier to lift the block on the incline.

What is the purpose of the incline in this experiment?

The incline in this experiment adds an additional force component, the force of gravity, to the system. This allows for a more complex and realistic analysis of forces and motion.

What factors affect the motion of the blocks?

The motion of the blocks is affected by several factors, including the mass of the blocks, the angle of the incline, and the coefficient of friction between the blocks and the surface. These factors can be altered to observe their impact on the motion of the blocks.

What can this experiment teach us about physics?

This experiment allows for the application and observation of fundamental physics principles, such as force, motion, and energy. It also demonstrates how simple machines, like pulleys, can be used to make tasks easier by changing the direction and magnitude of forces.

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