why does horse require more force to start a tonga than to keep it moving ?
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When the horse is applying force to start the cart it has to overcome static friction and to keep the cart in motion,the horse has to overcome sliding friction. But static friction is more than sliding friction ,so the horse, pulling a cart has to apply a greater force to start the cart than to keep the cart in motion.
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Horse require more forse to start a tonga than to keep it moving because the tonga is in rest.
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