 Newton's Laws Study Guides You'll need to be able to recognize these (and various permutations) on sight: Ramps Hanging Objects Elevators   Dragging Blocks Hangers & Sliders Pully Problems  1) Apply Newton's Laws to determine the state of the object in question Is the object at rest (equilibrium, static etc...)? Is the object out of balance, accelerating? Sum of the forces in x....(ALWAYS) Sum of the forces in y... (ALWAYS) Is friction present? 2) Can you assume the object is 'behaving well'? All connected objects are moving together at the same rate? No excessive force is applied that would cause your string to snap, stretch or launch your object off the surface? 3) Is it a WHOLE lot easier to apply a systems analysis? Formulae Objectus: ∑Fx = max (the sum of the forces acting on an object (or system of objects) in the x direction results in that object (or system of objects) accelerating at a measureable rate in the x direction if the resulting forces are imbalanced) ∑Fy = may (the sum of the forces acting on an object (or system of objects) in the y direction results in that object (or system of objects) accelerating at a measureable rate in the y direction if the resulting forces are imbalanced)