![]() ![]() Projectiles arriving at the top of their flight must stop going upwards before turning around to fall. It has t in it (the thing we’re trying to find out) and it looks like it’s going to fall apart in to something easier! Let’s take the first relation in the “always-true” toolbox for the y direction. Not quite! But we already know v 0(from the ‘facts box’) and if only we knew t H (the time taken to get up to H), we’d have the answer in our hands.īut we can’t apply anymore ‘always true’ statements in the x direction, so let’s scene shift to the y direction: Let’s pull an ‘always true’ statement out of the toolbox for the x direction and see if it leads us straight to the answer or not: Step 4: The question wants to know about the x distance covered while the rock is on its way up to H. Note: We took care of negative signs in Step 3 by “pulling the negative” out of g since g points towards decreasing y. Since we’ve already accounted for direction, everything we sub in is positive from now on. It should end up looking something like this: Step 3: Make a box of ‘always true’ statement. Step 2: Make a ‘facts box’ of the question info already tagged on your diagram. Step 1: Diagram the whole situation and label everything. ![]() How far will the rock have travelled horizontally by the time it’s at the top of its flight? The Set-up: So, let’s dig into some questions! Question #1Ī catapult launches a 2.0 kg rock at 3.2 m/s, 30° elevation, from a 7.0 m high rooftop. Tip #3: Stick to what you know is true – assume nothing! Tip #2: Make angles and relative lengths of vectors as realistic as possible. Tip #1: Make your diagram as big and as neat as possible. So, what are you waiting for? Let’s jump straight in! Projectile Motion Question #1 Question #2 Question #3 Circular Motion Question #4 Question #5 Gravity Question #6 Question #7 Question #8 Projectile Motion In this article, we’ll develop your solving strategy and work through a bunch of sample questions in Advanced Mechanics. Notice number 3 is just the combination of 1 and 2!
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