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Discussion and Debate
Discussion and Debate
Physical & Life Sciences
Not Slippery When Wet
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<blockquote data-quote="sjastro" data-source="post: 76121882" data-attributes="member: 352921"><p>Your question seems to have developed wings because it bears very little resemblance to its original format.</p><p></p><p></p><p></p><p>What you are now asking is whether rolling resistance is responsible for reducing friction.</p><p>The answer is the friction is greater when compared to the kinetic friction of locked tyres.</p><p>Rolling resistance or rolling friction depends on static friction not kinetic friction.</p><p>Static friction is higher than kinetic friction since you need to overcome inertia to set the object in motion.</p><p></p><p>There is also an engineering design to have higher friction for rotating tyres in terms of vehicle safety; it’s why tyres are made from rubber.</p><p>Tyres undergo a deformation under load which increases both the surface area of the tyre contacting the road and the static friction.</p><p>The other property is the viscoelastic nature of rubber.</p><p>Despite rubber being associated with elasticity there are many other materials that are more elastic such as metals.</p><p>Since rubber is not as elastic (=viscoelastic) a rotating tyre which undergoes compression and recovery results in hysteresis or energy loss.</p><p>This results in an uneven pressure distribution on the tyre which increases the rolling resistance and makes it safer to drive a car.</p><p style="text-align: center"><img src="http://members.iinet.net.au/~sjastro/astrophysics/tyre.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="sjastro, post: 76121882, member: 352921"] Your question seems to have developed wings because it bears very little resemblance to its original format. What you are now asking is whether rolling resistance is responsible for reducing friction. The answer is the friction is greater when compared to the kinetic friction of locked tyres. Rolling resistance or rolling friction depends on static friction not kinetic friction. Static friction is higher than kinetic friction since you need to overcome inertia to set the object in motion. There is also an engineering design to have higher friction for rotating tyres in terms of vehicle safety; it’s why tyres are made from rubber. Tyres undergo a deformation under load which increases both the surface area of the tyre contacting the road and the static friction. The other property is the viscoelastic nature of rubber. Despite rubber being associated with elasticity there are many other materials that are more elastic such as metals. Since rubber is not as elastic (=viscoelastic) a rotating tyre which undergoes compression and recovery results in hysteresis or energy loss. This results in an uneven pressure distribution on the tyre which increases the rolling resistance and makes it safer to drive a car. [CENTER][IMG]http://members.iinet.net.au/~sjastro/astrophysics/tyre.png[/IMG][/CENTER] [/QUOTE]
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