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
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.
rizkaramat asking:
please somebody explain
Community Comments (9)
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chris146 Posts: 7 25.04.2012 / 13:36
15N force. mass of 30kg = 300N
15/300 = 1/20
15/300 = 1/20
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alberto Posts: 8 07.04.2013 / 13:34
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.
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arslan1995 Posts: 3 30.10.2015 / 02:22
I've been taught to always convert grams into Kilograms and leave kg as they are, why is it different here.
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dimky Posts: 514 30.10.2015 / 23:02
Hello arslan.
I don't see any grams here.
I don't see any grams here.
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Edmaster001 Posts: 1 03.11.2015 / 15:12
mate there are no grams
R
RuseofBabulal Posts: 1 03.11.2015 / 18:43
well guys, where I'm from we don't deal with grams. Only ounces.
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arslan1995 Posts: 3 26.11.2015 / 13:50
i will merk all u lots.
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Brian Dyas Posts: 2 30.09.2021 / 22:08
Since no one has been on here for a while is there now a better site ?
J
Jordi Posts: 198 01.10.2021 / 12:17
what do you mean everyone is here they just refrain from commenting ;P
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