Qualification > Queries

ANY DOUBTS HERE!!!

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halosh92:
nov 2007 physics p2 cie
Q2dii
dont we have to subtract the forces? not add them?

Meticulous:
No..you add them

f=force of boy, R=resultant, F=friction

therefore: f-F=R

f=F+R

got it?

halosh92:

--- Quote from: ~ A.F ~ on May 31, 2010, 03:19:12 pm ---No..you add them

f=force of boy, R=resultant, F=friction

therefore: f-F=R

f=F+R

got it?

--- End quote ---

not rili , dont we have to find the resultant in this case..i mean friction is 23 and the force of boy is 75 ..??

Meticulous:
Dont think of numbers

First:

resultant force= force by kid-friction

is that clear?

now add the resultant (mass x acceleration) to friction

halosh92:

--- Quote from: ~ A.F ~ on May 31, 2010, 03:54:21 pm ---Dont think of numbers

First:

resultant force= force by kid-friction

is that clear?

now add the resultant (mass x acceleration) to friction

--- End quote ---

YEPP :D
THANXXX

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