help in M1!

YaZmin

YaZmin

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hey guys! can anyone help me solve M1 2009 January Q5 and provide me with an explanation? i really dont get it!:oops:
 
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.DR.me.

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YaZmin said:
heres the link:
http://www.freeexampapers.com/#A Level/Maths/Edexcel/2009 Jan
Click to expand...
a ) draw the normal (perpendicular to the plane )
the weight (downward )
the PN force which is already given


b) i) first find the value of the angle
Tan A =3/4 >>>> A = 36.8
now there is 2 ways .. i guess whats easier is to resolve the normal force vertically and horizontally (since the for PN acting horizontally & the weight Vertically downward )
and as we know Normal force = MF ( M stands for the coefficient of friction ) (F > force )
resolving Vertically >>>>> weight =normal force , since its in equilibrium
so MF cos 36.8 = 1.1g ................................ now this 36.8 is found by a rule , i will try and explain it if you have trouble in it just let me know !
0.5Fcos36.8 = 1.1g
F = 26.93 N

ii ) here you will resolve the normal force too but this time horizontally !
MFsin36.8 =P
0.5(26.93)(sin36.8) = P
& find it !


thats all !
 
YaZmin

YaZmin

Messages
61
Reaction score
132
Points
43
.DR.me. said:
a ) draw the normal (perpendicular to the plane )
the weight (downward )
the PN force which is already given


b) i) first find the value of the angle
Tan A =3/4 >>>> A = 36.8
now there is 2 ways .. i guess whats easier is to resolve the normal force vertically and horizontally (since the for PN acting horizontally & the weight Vertically downward )
and as we know Normal force = MF ( M stands for the coefficient of friction ) (F > force )
resolving Vertically >>>>> weight =normal force , since its in equilibrium
so MF cos 36.8 = 1.1g ................................ now this 36.8 is found by a rule , i will try and explain it if you have trouble in it just let me know !
0.5Fcos36.8 = 1.1g
F = 26.93 N

ii ) here you will resolve the normal force too but this time horizontally !
MFsin36.8 =P
0.5(26.93)(sin36.8) = P
& find it !


thats all !
Click to expand...


hiya! thnx 4 the help but the answer as in the marking scheme for F is 9.8 N and not 26.93 N? but thnx 4 trying
 
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