3. A rugby lployer sits on a scrum machine that weighs F. 2004. Given that the cooffiaut of static friction is 0.18 mathrm(lls)= the coefficient of kinetic friction is 0.15 and the force requirod to push both the scrum machine and the players into motion is 81 mathrm(~N)

To solve this problem, we need to determine the force required to overcome static friction and set the scrum machine and players in motion. The force of static friction can be calculated using the formula: where is the coefficient of static friction and is the normal force. In this case, the normal force is equal to the weight of the scrum machine, which is . Since the force required to push both the scrum machine and the players into motion is , it means that this force is equal to the force of kinetic friction once the motion has started. The force of kinetic friction can be calculated using the formula: where is the coefficient of kinetic friction. In this case, the normal force is still equal to the weight of the scrum machine, which is . Therefore, the force required to push both the scrum machine and the players into motion is , which is equal to the force of kinetic friction once the motion has started.