Hard Rubber
The coefficient of static friction between hard rubber and normal street pavement is about 0.9.?
What is the maximum angle you can leave a car parked.
Hi
Draw a forces diagram and resolve the weight into two components, one normal to the slope and one along it. You will see that the normal component is mg*cosθ. So this must also be the magnitude of the normal (reaction) force.
You will also see that the component on the weight acting down the slope is mg*sinθ. This is the force that the friction must balance.
The friction is 0.9 times the normal force so
mg*sinθ=0.9R
mg*sinθ=0.9*mg*cosθ
=>sinθ=0.9cosθ
=>sinθ/cosθ=0.9
=>tanθ=0.9
The Ice Age – Hard Rubber Orchestra
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