Window sliders have ball bearings because
a) Less force is required to move the slider.
b) Rolling friction is less than sliding friction.
c) it increases the friction.
d) it reduces the friction.
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b) Rolling friction is less than sliding friction
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Window sliders have ball bearings because
a) Less force is required to move the slider.
b) Rolling friction is less than sliding friction.
c) it increases the friction.
d) it reduces the friction.
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