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Mechanics

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3 Feb 2008 10:19:28 IST

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405

mechanics

None

PLEASE SOLVE IT

a body of mass 5kg is acted is acted upon two perpendicular force 8N, 6N.

give the magnitude and direction of acceleration of the body

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Comments (5)

Akhil

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Joined: 17 Jan 2008

Posts: 1451

3 Feb 2008 10:26:38 IST

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Resultant force is

^{[ ]}

8²+6² = 10N

direction is tan^-1(8/6)

Hence acceleration = F/m =2 m/s2

Desai Soham

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Joined: 31 Jan 2008

Posts: 49

3 Feb 2008 17:04:22 IST

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How can u ask sm 1 to reply withought metioning it to be a point object or a rigid object ??/

well if its a point object then just use vectors

if its a rigid 1 then first metion where the force is applie on the object

you_saket

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Joined: 11 Jan 2007

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3 Feb 2008 17:13:13 IST

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hey

thats incomplete questation

abhishek sinha

Forum Expert

Joined: 18 Dec 2007

Posts: 926

3 Feb 2008 18:24:22 IST

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Nope!!!!!!!!!!!!!

If it be rigid object then there may be some rotational motion and accn .

But as far as linear accn & motion is concerened the qn is perfectly O.K.

Rahul Raghavendra

Blazing goIITian

Joined: 9 Jan 2008

Posts: 843

3 Feb 2008 18:25:39 IST

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Consider any two perpendicular forces

resolve them into x and y axis

F_x = 8cos45 + 6sin45 = 14/

F_y = 8sin45 - 6cos45 = 2/

a_x = F_x/m=14/5

a_y =F_y/m =2/5

thus net accelaration a=

a_x² + a_y²

=2 m/s

this is a much safer method of getting the right answer

^{[ ]}^{[ ]}

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