Homework Help: Physics

Posted by Bryian on Wednesday, January 27, 2010 at 7:37pm.

Please help me with these three questions,they deal with coefficient of friction

1) A car rounds a turn of radius 25m at a speed of 20m/s. Find the coefficient of friction neccessary to keep the car on the road

2) A man is attempting to slide a piece of furniture weighing 750N long a floor. Ifhe exerts a force of 75N along a rope and angle of 35 degrees and the object does not move, what is the minimum value for te coeficient of friction?

3) Consider a block on a plane inclined at an angle of 30 degres. If the block weights 950N, what coefficient of friction is neccessary to hold it stationary?

Physics - bobpursley, Wednesday, January 27, 2010 at 8:00pm
1) set mv^2/r= mu*mg
solve for mu

2) the vertical component of tension reduces weight.

friciton= mu*(mg-75sin35)
horizontalforce= 75*cos35
set them equal, solve for mu.
3) I will be happy to critiqeu your thinking.
Physics - Bryian, Wednesday, January 27, 2010 at 8:05pm
thanks for your time and help, but I do not know what mu stands for
Physics - bobpursley, Wednesday, January 27, 2010 at 8:07pm
mu: coefficent of friction.
Physics - bryian, Wednesday, January 27, 2010 at 8:18pm
I got 13 for number 1, am I wrong?

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