It can hurt our foot more to kick a big rock than a small pebble
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A big rock has large mass than smaller pebble . Thus , the big rock has greater change in momentum than the pebble . When we kick to large rock , the change in momentum i.e. the force exerted by large rock is greater than smaller pebble . Due to this reason , it can hurt our foot more to kick a big rock than a small pebble .