Homework Help: Physics

Posted by neo on Saturday, March 16, 2013 at 6:55am.

John is pushing a wheelbarrow filled with sand on a building site the total mass of the wheelbarrow and its content is 30kg. When he applies force of 20 the wheel barrow moves forward at constant speed. What is the Magnitude of the friction between the wheels and the ground?

Physics - black_widow, Saturday, March 16, 2013 at 8:57am
Let the magnitude of friction force = f
acceleration ,a = 0 (because it moves with constant speed)
F=ma
20-f=30x0
f=20N
Physics - bobpursley, Saturday, March 16, 2013 at 10:09am
And curiously, that is the same magnitude of the friction between his shoes and the ground. Think on that, Newton.
Physics - black_widow, Sunday, March 17, 2013 at 6:41am
Yes the magnitude will be the same until the force exceed the maximum frictional force then the system will only move with an acceleration.

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