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/sci/ - Science & Math

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3073138 No.3073138 [Reply] [Original]

a) A man is dragging a box of supplies along a straight floor at a constant speed. The man is pulling with 23N. What is the maximum frictional force exerted between the floor and the box?


how does one calculate friction?

>> No.3073139

Shag carpet or wut?

>> No.3073142

Friction = the coefficient of friction here x the normal reaction of the box

>> No.3073146

It says he's travelling at constant speed so 23N.

Balanced forces means no acceleration.

>> No.3073147

he's dragging it across a 12 grit sandpaper floor

>> No.3073152

>>3073146
dude, its gotta be some fancy formula or something

>> No.3073155

wuts in the box?
A cute kitty?

>> No.3073160

>>3073155
its the schrodingers cat, nigger

>> No.3073167

>>3073146
This is correct. Physics is about thinking not about using equations it isn't as hard as people make it look or act like it is

>> No.3073170

>>3073152
No it don't nigga.

>> No.3073686

pascal

>> No.3073735
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3073735

friction is the coefficient of friction multiplied by the normal force of the box. you need the mass of the box and the (kinetic) friction coefficient. the problem implies he isn't pulling it with any upward component so the normal force is equal to the force of the box's weight. plug and chug.
i only answered this because it's physics 1 and thus i know it :(

>> No.3073808

Constant speed means the forward force (the man pulling) equals the resisting force (friction).

23 N

>> No.3073858

>>3073808
oh, cuz i figured that because he's moving, the frictional force could not possibly be greater than or equal to the external force of the man pulling.
cuz then he wouldn't be moving.

>> No.3073885

>>3073858
"constant speed" --> Newton's first law --> 0 net force --> balanced forces --> 23N
http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion

>> No.3073964

>>3073858
ΣF = ma, right?
Mass is constant, so the force here is simply proportional to acceleration. Constant speed means the overall acceleration is zero, so the sum of the forces must equal zero. The sum of the forces equal the pulling force minus the resisting force, so:
P - f = 0
P = f
Where P is the pulling force and f is the frictional force.