A force of 15N is needed to move a body of mass 30kg along a footpath with uniform velocity. Find the coefficient of dynamic friction.(take g as 10m/s/s).
- 1/20.
- 1/10.
- 1/40.
Explanation from PART66Online
At uniform velocity the applied force balances friction, so F = mu x m x g. Rearranging, mu = 15 / (30 x 10) = 15 / 300 = 1/20. The coefficient of dynamic friction is dimensionless and equals the friction force divided by the normal load.
R
rizkaramat asked · 15 Apr 2012
please somebody explain
Community Comments (9)
C
chris146
25 Apr 2012
15N force. mass of 30kg = 300N
15/300 = 1/20
15/300 = 1/20
A
alberto
7 Apr 2013
coefficient of dynamic friction = FORCE / WEIGHT.
THEREFORE FORCE = 15N AND WEIGHT IS 300N AS IT HAVE TO BE CONVERTED FROM MASS 30KG TO WIEGHT BY USING THIS SIMPLE EQUATION WEIGHT=MASS*GRAVITY.
THEREFORE FORCE = 15N AND WEIGHT IS 300N AS IT HAVE TO BE CONVERTED FROM MASS 30KG TO WIEGHT BY USING THIS SIMPLE EQUATION WEIGHT=MASS*GRAVITY.
A
arslan1995
30 Oct 2015
I've been taught to always convert grams into Kilograms and leave kg as they are, why is it different here.
P
PART66Online
30 Oct 2015
Hello arslan.
I don't see any grams here.
I don't see any grams here.
E
Edmaster001
3 Nov 2015
mate there are no grams
R
RuseofBabulal
3 Nov 2015
well guys, where I'm from we don't deal with grams. Only ounces.
A
arslan1995
26 Nov 2015
i will merk all u lots.
B
Brian Dyas
30 Sep 2021
Since no one has been on here for a while is there now a better site ?
J
Jordi
1 Oct 2021
what do you mean everyone is here they just refrain from commenting ;P
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