Hi, So I'm having a little bit of trouble answering a couple of simple questions regarding simple harmonic motion... [Image] All of this is regarding the really simple image ^ Oscillations are not always described by equations; you should also be able to analyze the graphical representation of motion. Answer the following questions related to the graph describing the oscillations of the block on a spring. -Note that the vertical axis represents the x coordinate of the oscillating object, and the horizontal axis represents time. Easy enough, right? Here are some answers I got that were correct: Q: What is the period T of oscillations: A: 0.02s Q: How long a time t does the object take to travel from the point of maximum displacement to the opposite point of maximum displacement? A: 0.01s Q: An object passes the equilibrium position. What time t would elapse before it passes the equilibrium position again? A: 0.01s And here is the one I'm having trouble with: Q: What distance d does the object cover during one period of oscillation? ...They want the answer in meters. ...But they seem to want a number, and all I can come up with is either 0, 2A, or A... Because I don't have A, I'm not sure how to solve this-- and if I have to find A, I'm not quite sure how to do it... Any pointers? And for one other-- In a physics lab, you attach a 0.200-kg air-track glider to the end of an ideal spring of negligible mass and start it oscillating. The elapsed time from when the glider first moves through the equilibrium point to the second time it moves through that point is 2.60 s. Find the spring's force constant. Okay, I know the formulas-- And I've attached an image of the interval of time they're talking about-- (It'd be the red part) But would I be assuming, here, that gravity is slowing this one down? They say, 'In a physics lab'... ...So this wouldn't be an ideal system... But an ideal spring? I've gotten a host of different numbers-- all of which are incorrect. Any ideas?