However, to simplify the notation, we will simply represent the component vectors as x x and y y.) If we continued this format, we would call displacement s s with components s x s x and s y s y. (Note that in the last section we used the notation A A to represent a vector with components A x A x and A y A y. ![]() The magnitudes of these vectors are s, x, and y. Figure 3.34 illustrates the notation for displacement, where s s is defined to be the total displacement and x x and y y are its components along the horizontal and vertical axes, respectively. (This choice of axes is the most sensible, because acceleration due to gravity is vertical-thus, there will be no acceleration along the horizontal axis when air resistance is negligible.) As is customary, we call the horizontal axis the x-axis and the vertical axis the y-axis. The key to analyzing two-dimensional projectile motion is to break it into two motions, one along the horizontal axis and the other along the vertical. This fact was discussed in Kinematics in Two Dimensions: An Introduction, where vertical and horizontal motions were seen to be independent. The most important fact to remember here is that motions along perpendicular axes are independent and thus can be analyzed separately. In this section, we consider two-dimensional projectile motion, such as that of a football or other object for which air resistance is negligible. The motion of falling objects, as covered in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. The object is called a projectile, and its path is called its trajectory. Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. Apply the principle of independence of motion to solve projectile motion problems.Determine the location and velocity of a projectile at different points in its trajectory.Identify and explain the properties of a projectile, such as acceleration due to gravity, range, maximum height, and trajectory.If you don't feel air pushing from the cylinder, it's likely that the piston rings need to be replaced (for an accurate compression reading, use a compression gauge).By the end of this section, you will be able to: If you see deposits or corrosion on the electrodes, replace the spark plug.įinally, to check for compression, remove the spark plug, press your thumb over the opening and pull the starter cord. Next, disconnect the spark plug wire and remove the spark plug. If the fuel lines are okay, you may need to rebuild or replace the carburetor because a dirty carburetor won't supply the engine with fuel. Replace the fuel lines if you find cracks in the lines. Air enters the carburetor instead of fuel when the fuel lines have cracks. If the fuel is fresh, check the fuel lines for cracks. Add fuel stabilizer to the gas when you refill the tank to help keep the fuel fresh. First, make sure there's fresh gas in the tank-old gas accumulates water and burns poorly. The engine needs gas, compression and spark in order to start. What to do when your Echo gas line trimmer won't start Reconnect the spark plug wire to the spark plug.Using your diagram or digital photograph for reference, reconnect the fuel lines to the carburetor.Install the fuel filter onto the end of that fuel line and drop it into the tank. Fish the smaller line out of the tank and cut the end of it square. Push the smaller fuel supply line into the tank far enough so that the fuel filter will lay on the bottom of the tank. ![]() Force the cut ends of the fuel lines into the proper holes of the tank, using needle-nose pliers if necessary. Cut the ends of the new fuel lines at an angle so that they're easier to thread into the tank.Tip the trimmer and shake any fuel line pieces out of the tank. The use a small screwdriver to push the rest of the lines into the tank. If you can't pull the lines out, cut the lines flush with the tank. If necessary, use needle-nose pliers to grip the lines. Pull the old fuel lines out of the tank.Remove the fuel lines from the carburetor using a pair of needle-nose pliers. Make a diagram or take a picture of how the fuel lines are configured between the tank and the carburetor.Pull the fuel filter off the end of the fuel line. Fish the fuel filter out of the tank using a pair of needle-nosed pliers or a straightened wire clothing hanger with a hook formed on the end. ![]() In a well-ventilated area, remove the fuel cap and empty the fuel tank into an approved storage container.Wear work gloves to protect your hands and disconnect the spark plug wire.How to replace fuel lines in your Echo gas line trimmer
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