Why is there less friction on an object when
a) when the object has wheels
b) When you are trying to move small blocks on rollers
c) When an object is being moved on a smooth surface
a) when the object has wheels
b) When you are trying to move small blocks on rollers
c) When an object is being moved on a smooth surface
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a) less surface area of contact
b) again, less contact between surfaces
c) a smooth surface has almost no static friction(ie F=uN, when u, coefficient of static friction, is close to 0, F is really small) so you can move relatively easy
b) again, less contact between surfaces
c) a smooth surface has almost no static friction(ie F=uN, when u, coefficient of static friction, is close to 0, F is really small) so you can move relatively easy
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Cause on wheels the object is not sliding on the ground. Instead, there is rolling friction between the cart and the axles/wheels.