Chapter 7. Collision force, contract time, and momentum change (7-24)

Question

nGTcB8m+RZt2tfotL5Sy5l24yJl1jGvFQR3caivylZ45zvd1yDdmcFwBwLM+t8X7gKkLnA==

{"title":"Force exerted on an object during a collision","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"18,23,91,46\"}]"} {"title":"Duration of the collision = contact time","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"97,11,121,33\"}]"} {"title":"Change in the momentum vector p of the object during the collision","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"186,16,204,33\"},{\"shape\":\"rect\",\"coords\":\"264,7,297,38\"}]"}

Question

DixnmO5iWLEqJq61tqdEnWV4bj7cLJfGrVXxiqRIa67Bq8pZB4xCuCFfikYZYfIKXlY7nf4vj1Ih/zEb

{"title":"Force exerted on an object during a collision","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"18,23,91,46\"}]"} {"title":"Duration of the collision = contact time","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"97,11,121,33\"}]"} {"title":"Change in the momentum vector p of the object during the collision","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"186,16,204,33\"},{\"shape\":\"rect\",\"coords\":\"264,7,297,38\"}]"}

Question

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{"title":"Force exerted on an object during a collision","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"18,23,91,46\"}]"} {"title":"Duration of the collision = contact time","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"97,11,121,33\"}]"} {"title":"Change in the momentum vector p of the object during the collision","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"186,16,204,33\"},{\"shape\":\"rect\",\"coords\":\"264,7,297,38\"}]"}

Review

If the momentum change occurs as a result of a collision, the net external force on an object is predominantly due to the \perpher object with which it is colliding; any \perpher forces are very weak by comparison (see Section 7-3). So for the special case of a collision, Equation 7-23 becomes: