# Simple Mechanics question I do not understand

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Thread starter 5 years ago
#1
http://s8.postimg.org/7gglxkqvp/mechprob1.png

The part a) of the question I do not understand is the horizontal force.

If the horizontal forces acts on the parcel, I thought the vertical force component (50sin10) will be going UP rather than down as it says in the answer. So in my words I thought..

R + 50sin10 = 4gcos10.. R = 4gcos10 - 50sin10

Can someone explain why the vertical component of the Horizontal force is down rather than up?
0
5 years ago
#2
(Original post by The Best1)
http://s8.postimg.org/7gglxkqvp/mechprob1.png

The part a) of the question I do not understand is the horizontal force.

If the horizontal forces acts on the parcel, I thought the vertical force component (50sin10) will be going UP rather than down as it says in the answer. So in my words I thought..

R + 50sin10 = 4gcos10.. R = 4gcos10 - 50sin10

Can someone explain why the vertical component of the Horizontal force is down rather than up?
draw this force as a pulling force rather than a pushing force and this might make more sense
0
5 years ago
#3
(Original post by The Best1)
http://s8.postimg.org/7gglxkqvp/mechprob1.png

The part a) of the question I do not understand is the horizontal force.

If the horizontal forces acts on the parcel, I thought the vertical force component (50sin10) will be going UP rather than down as it says in the answer. So in my words I thought..

R + 50sin10 = 4gcos10.. R = 4gcos10 - 50sin10

Can someone explain why the vertical component of the Horizontal force is down rather than up?
as I will be off to bed soon look also at some worked out examples to help you, particularly with reference to the "pushing force"

m1_equilibrium.pdf
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Thread starter 5 years ago
#4
thanks a lot for replying, i think i get the general gist of it, but I don't understand the vectors part

http://s30.postimg.org/j2ldl373l/mechprob1.png

this picture shows you my thinking of why my mind keeps telling me the vertical component is upwards
0
5 years ago
#5
(Original post by The Best1)
thanks a lot for replying, i think i get the general gist of it, but I don't understand the vectors part

http://s30.postimg.org/j2ldl373l/mechprob1.png

this picture shows you my thinking of why my mind keeps telling me the vertical component is upwards
look at the questions I attached in post 3
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Thread starter 5 years ago
#6
yeah i looked at that and posted after, i still don't understand the work behind the vertical component being downwards rather than upwards, sorry for dragging this
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Thread starter 5 years ago
#7
wait a second... i just realised what i did wrong as i read more of the questions in your file..

wow, wtf, it was pretty simple too

thanks a lot for the help!!
0
5 years ago
#8
(Original post by The Best1)
wait a second... i just realised what i did wrong as i read more of the questions in your file..

wow, wtf, it was pretty simple too

thanks a lot for the help!!
no worries
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