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Below is a box at rest on the floor with some friction. What would I have to do to get it to move at constant velocity? Where FA F fk F fk FA Below is a box at rest on the floor with some friction. What would I have to do to get it to move at constant velocity? Where FA F fk F fk FA What happens if we put a force on a rigid object that can rotate about a fixed axis? The force provides what we will call for now a “turning effect.” Is the size of the force the only thing responsible for the turning effect? Is the size of the force the only thing responsible for the turning effect? Is the size of the force the only thing responsible for the turning effect? Not only the force is responsible for the turning effect, but also where the force is applied with respect to the axis of rotation. Axis of Rotation Look at the position of the door handle. Why is it typically as far away as possible from the axis of rotation? The amount of “turning effect” appears to depend on both the magnitude of the force and where that force is applied. Line of action – line along which the force acts Lever armr – the perpendicular distance between the axis of rotation and the line of action of the force (Moment arm) F2 m2 g r2 F2 m2 g r1 F1 m1g What combination of force and lever arm put the object in balance? Purpose: To create a mathematical model that represents the “turning effect” as some combination of the force and the lever arm. r2 Do not forget, the mass hangers also have a mass (50. g = 0.050 kg) that must be included in the total mass. F2 m2 g r1 F1 m1g Clockwise Turning Effect Counterclockwise Turning Effect Balanced (equal in magnitude)