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November 01, 2025, 03:36:20 pm
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Glockmeister

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A question
« on: August 18, 2008, 07:41:20 pm »
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A particle slides from rest down a rough plane inclined at 60 degrees to the horizontal. Given that the coefficient of friction between the particle and the plane is 0.8, find the speed of the particle after it has travelled 5m.
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phagist_

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Re: A question
« Reply #1 on: August 18, 2008, 07:43:23 pm »
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Have you drawn a free body diagram with all the forces acting on it?

Then it is only a matter of getting the acceleration from the net force then applying constant acceleration formulae.
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Glockmeister

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Re: A question
« Reply #2 on: August 18, 2008, 07:57:44 pm »
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Done that, didnt get the answer they have in the book.
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"this post is more confusing than actual chemistry.... =S" - Mao

[22:07] <robbo> i luv u Glockmeister

<Glockmeister> like the people who like do well academically
<Glockmeister> tend to deny they actually do well
<%Neobeo> sounds like Ahmad0
<@Ahmad0> no
<@Ahmad0> sounds like Neobeo

2007: Mathematical Methods 37; Psychology 38
2008: English 33; Specialist Maths 32 ; Chemistry 38; IT: Applications 42
2009: Bachelor of Behavioural Neuroscience, Monash University.

Mao

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Re: A question
« Reply #3 on: August 18, 2008, 08:02:50 pm »
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forces:
gravity: component in the direction of the slope
           component perpendicular to the slope (equal to the normal reaction force)
friction: in the direction opposing the velocity (i.e. upwards parallel to the slope)

acceleration due to gravity:

deceleration due to friction:

net acceleration:

after 5 meters:





(i hope?)
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Glockmeister

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Re: A question
« Reply #4 on: August 18, 2008, 08:21:14 pm »
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Cheers Mao. I somehow left out the g out of the cos... somehow
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"this post is more confusing than actual chemistry.... =S" - Mao

[22:07] <robbo> i luv u Glockmeister

<Glockmeister> like the people who like do well academically
<Glockmeister> tend to deny they actually do well
<%Neobeo> sounds like Ahmad0
<@Ahmad0> no
<@Ahmad0> sounds like Neobeo

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2009: Bachelor of Behavioural Neuroscience, Monash University.

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Re: A question
« Reply #5 on: August 18, 2008, 10:02:20 pm »
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Alternatively with physics we might have





In this case and because we only need the 'potential' component down the slope:

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Mao

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Re: A question
« Reply #6 on: August 18, 2008, 10:13:26 pm »
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ahhh DivideBy0, you should realise they are exactly the same :P

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