In one sentence, describe what the following article is about: Rather than hanging with the crowd that always lands in detention, find friends who keep up with their grades and participate in appropriate after-school activities. Look for classmates who share your interests, and spend time with them. For instance, if you love comic books, find a few friends who share your passion. You could even start a comic book club after school. A great way to stay out of trouble is to get involved at school. Join the student council/government or look for other ways to help out. Volunteer to organize a school event, such as a dance or fundraiser. You could also reach out to a coach and see if they could use your help managing a team or club. Many schools put on a play during the spring. See how you can get involved. They often need people to help out with the costumes, props, and sets. When you have a lot of free time on your hands, it can be easy to get into trouble. The best thing to do is to stay busy. Join a sports team or a school club so that you have activities after school. You can also get a job, which will keep you busy as well as provide you with some extra cash. For example, join the softball team, the art club, the swim team, or the drama club. As for jobs, offer to babysit your neighbor's children, mow lawns in your neighborhood, or apply for work at a local ice cream shop or restaurant, or even go to the park to let yourself let loose.
Summary: Choose your friends wisely. Get involved at school. Stay busy after school.

Before you do anything else, ensure that the fan is turned off and cannot turn back on until you are finished cleaning it. Most models will have a plug that is located directly behind the cover. You could remove the cover first and unplug the fan, but just to be safe, go and temporarily pull the breaker for your bathroom. The fan is now safe to work on. Unscrew the assembly that is holding the fan in place, then very gently remove the fan. Be careful not to drop the fan or hit it on the side of the exhaust pipe as that could potentially chip the fan blades. Broken fan blades will cause the fan to be louder and less effective.
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One-sentence summary -- Turn off the power. Remove the fan.

Q: Many saltwater pools have a chlorine generator, feeder, or chlorinator that releases free chlorine into the water. Locate the control panel box and turn down the dial 1 level. Retest your water the following day and further adjust the dial or turn off the machine, if necessary. If you turn off the machine, be sure to test the water 2-3 times per day, and turn the machine back on when the chlorine drops below 3.0 ppm. You may have chlorine tablets or a chlorine floater in the pool. If so, remove these items immediately so they stop increasing the amount of chlorine in the water. Don't replace these items until the chlorine level has dropped below 3.0 ppm. Sunlight is incredibly effective at reducing the amount of chlorine in a pool! The UV rays break down the chlorine and allow it to evaporate. Simply leave your pool uncovered and exposed to direct sunlight. With no cyanuric acid (CYA) in the pool up to 90% of the chlorine can evaporate in as little as 2 hours on a hot, sunny day, so be sure the level doesn't drop below 1.0 ppm. Purchase a chemical that neutralizes chlorine, like sodium sulfite or sodium thiosulfate. Follow the instructions on the package for use. Typically, you'll add a dose to the skimmers with the filter running, and the chemicals will quickly lower the amount of chlorine in the water. You should be able to find these chemicals at pool supply stores and online. If the chlorine levels are really high, you can simply swap out some of the existing water for freshwater. Siphon 25% of the water out of the pool, then add freshwater to it. To siphon out the water: Submerge a tube in the pool and allow it to completely fill up with water. Plug 1 end of the tube and transfer it to an empty container at a lower elevation than the pool. Unplug the end of the tube and allow it to drain into the container. Pull the tube out of the pool when you've siphoned enough water.
A: Lower the output from the chlorine generator or feeder if you have one. Remove all chlorine additives from the pool, if applicable. Allow sunlight to break down the chlorine if the weather permits. Add a chlorine-neutralizing chemical to the pool for a quick fix. Replace 25% of the saltwater with freshwater if the levels are very high.

Problem: Article: Newton's second law of motion states that when the forces acting on an object are unbalanced, the object will accelerate. This acceleration is dependent upon the net forces that act upon the object and the object's mass. Using this law, acceleration can be calculated when a known force is acting on an object of known mass. Newton's law can be represented by the equation Fnet = m x a, where Fnet is the total force acting on the object, m is the object's mass, and a is the acceleration of the object. When using this equation, keep your units in the metric system. Use kilograms (kg) for mass, newtons (N) for force, and meters per second squared (m/s2) for acceleration. To find the mass of an object, simply place it on a balance or scale and find its mass in grams. If you have a very large object, you may need to find a reference that can provide you with the mass. Larger objects will likely have a mass with the unit of kilograms (kg). For this equation, you will want to convert the mass into kilograms. If the mass you have is in grams simply divide that mass by 1000 to convert to kilograms. A net force is an unbalanced force. If you have two forces opposing each other and one is larger than the other, you will have a net force in the direction of the larger force. Acceleration happens when an unbalanced force acts on an object, causing it to change speeds towards the direction the force is pushing or pulling it. For example: Let's say you and your big brother are playing tug-of-war. You pull the rope to the left with a force of 5 newtons while your brother pulls the rope in the opposite direction with a force of 7 newtons. The net force on the rope is 2 newtons to the right, in the direction of your brother. In order to properly understand the units, know that 1 newton (N) is equal to 1 kilogram X meter/second squared (kg X m/s2). You can change this formula around to solve for acceleration by dividing both sides by the mass, so: a = F/m. To find the acceleration, simply divide the force by the mass of the object being accelerated. Force is directly proportional to the acceleration, meaning that a greater force will lead to a greater acceleration. Mass is inversely proportional to acceleration, meaning that with a greater mass, the acceleration will decrease.
Summary:
Define Newton's Second Law of Motion. Find the mass of your object. Calculate the net force acting on your object. Rearrange the equation F = ma to solve for acceleration.