Question

Case 1: A 500 lbf platform of length L:1o ft is pulled horizontally at constant speed, a distance d-10 ft on a surface with coefficient of friction o.7. A cart weighing soo lbf sits at the center of the platform with the rakes locked. Calculate the work done by the ground friction force on the pull force Case 2: Now the process is repeated but as the platform is slid on the ground, the soolb cart (motorized) travels at constant speed on the platform a distance of 3 ft (relative to the platform) while the platform is slid 10 feet You may assume negligible friction force between the cart and platform due to the constant cart speed. Calculate the work done by the ground friction pull force The question to consider is if the change in horizontal movement of the system ca (relative to the ground) changes the friction work. The total ground friction force remains the same (AN) but the resultant N location relative to the ground moves to a different position in case 2 compared to case 1 Does this alter the friction work done on the platform by the ground or not?

Answer 1

Case1 - mg Case ce

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