MOVING ABOUT QUESTIONS (2) (1 Viewer)

atar90plus · Feb 9, 2012

I was wondering if anyone can help me with this moving about question. This question was in another thread but know one answered it. The first 2 questions are related to the first attached image. Could you guys please show me the full working out and solutions

Q5 a) Calculate the acceleration of the system

b) Calculate the tension in the string connecting the blocks

someth1ng · Feb 9, 2012

This is a weird question - do you know the answers?

I'm suspecting that a=24.5ms^-2 but I'm not sure exactly what is meant by "system".

IamBread · Feb 9, 2012

Well there are 2 forces acting on the system, the tension in the string and gravity. The acceleration is going to be <10ms^-2 as the tension is supplying a resisting force.

IamBread · Feb 9, 2012

Q5 a)
$$There are 2 forces acting on the system, the tension in the string and gravity. The force from the gravity, using $g = 10ms^{-2}$ is $ \\\\ F=ma \\\\ = 5kg \times 10ms^{-2} \\\\ = 50N$

$$Now, the other mass is resisting the acceleration by gravity, and adding more mass to the system. The amount of force excerted by gravity is the same, the total mass is just the sum of the 2 masses (if that makes sense). $ \\\\ F= ma \\\\a = \frac{F}{m} \\\\ = \frac{50}{7}ms^{-2}$

b)

$$Now that we have the acceleration of the system, we can find the tension provided by the string. Again, we just simply use $ \\\\F=ma \\\\= 2 \times \frac{50}{7}ms^{-2} \\\\ $As it is a resisting force, the value is going to be negative$\\\\=\frac{-100}{7}N$

IamBread · Feb 9, 2012

Also you shouldn't remove threads once the question has been answered. It'll help other people if they come across it and have a similar problem.

MOVING ABOUT QUESTIONS (2) (1 Viewer)

atar90plus

01000101=YES! YES! YES!

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