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This process will depend on the kind of bike and chain you have. The pictures you took earlier of your drivetrain should be helpful. Thread one end of the chain through the drivetrain so it meets its opposite end at the top or bottom midpoint between the wheels.  Chain links should fit onto the points of gears and run smoothly through all component parts of the drivetrain. If you feel resistance, it’s likely you’ve inserted the chain improperly. If you find yourself really struggling to get the chain back in the drivetrain, look up a tutorial on YouTube or do a keyword search for your bike’s manual online. Use your fingers to bring the ends of the chain together at the midpoint between the wheels. Slide the pin end-link into the slot of the opposite end-link. In many cases, you’ll feel the link click into place. When properly refastened, the master link should align evenly with other links. If the master link is fastened unevenly, it could cause the chain to warp, ruining it. With the master link connected, you’re finally ready to give the wheels a spin. The chain should pass smoothly through the drivetrain. If there is unnatural resistance or irregular noises from the chain (like groaning, scraping, or grinding), you may have reinstalled the chain incorrectly. Many small errors can be corrected with your fingers while the chain is still on the bike. In some cases, you may need to remove the chain completely and reinstall it from scratch. the chain. A quality chain lube will protect your chain from further rusting and the buildup of grime. Position the nozzle of the lube above the midpoint of the chain. While squeezing out a thin, steady stream, spin the wheels of the bike. When the chain returns to its starting position, it’s lubed and ready to ride.

summary: Replace the chain in the drivetrain. Refasten the master link. Check the motion of the chain. Lube


Summarize the following:
Normal force refers to the amount of force use to counteract the force of gravity. Imagine a block sitting on a table. The force of gravity pulls the block toward the Earth, but clearly, there is some force at work preventing the block from crashing through the table and finishing its descent toward the ground. The force responsible for stopping the block in spite of gravitational force is the normal force. When calculating an object's normal force when that object is at rest on a flat surface, use the formula: N = m * g  In this equation, N refers to the normal force, m refers to the object's mass, and g refers to the acceleration of gravity. For an object sitting on a flat surface, with no outside forces at work, the normal force is equal to the object's weight. In order to keep the object still, the normal force must be equal to the force of gravity at work on the object. The force of gravity at work on the object is that object's weight, or its mass multiplied by the acceleration of gravity.  Example: Find the normal force of a block with a mass of 4.2 kg. Doing so will give you the weight of the object, which ultimately equals the normal force of the object as it sits at rest.  Note that the gravitational acceleration at the Earth's surface is a constant: g = 9.8 m/s2   Example: weight = m * g = 4.2 * 9.8 = 41.16 The previous step should complete the problem, giving you your answer.  Example: The normal force is 41.16 N.

summary: Understand what normal force refers to. Know the equation for normal force of an object at rest. Multiply the object's mass and the acceleration of gravity. Write down your answer.


Summarize the following:
Baking soda makes a great natural stain remover. It's gentle enough to use on almost any type of fabric. Mix a tablespoon of baking soda with enough water to make a thick paste. Alternatively, mix the baking soda with hydrogen peroxide or white vinegar.  Baking soda paste is best used on fabrics that don't require dry cleaning. You'll have to rinse it away when you're finished, so the clothes will get wet. Baking soda paste works well to remove stains caused by oil, grease, dirt, food, and many other substances. Lightly rub it into the stain. Make sure it covers the entire stained area, overlapping the edges. Allow it to sit on the stain for 15 minutes.  If the stain is on sturdy clothing, you can scrub it using an old toothbrush. Scrub the baking soda into the stain to make sure it can treat all of the fibers. This method is fine to use on denim and thick cotton. Don't scrub the baking soda into delicate fabric. Silk, satin and other thin fabrics could warp when scrubbed. Run it under warm running water to rinse away the baking soda along with the stain. For more delicate fabrics, you can wipe away the baking soda using a dampened cloth. Some difficult stains require more than one treatment. Apply a second round of paste to the stain. Let it sit for 15 minutes, then rinse it away. If the stain remains, you may need to use a chemical stain remover or take the item to be professionally cleaned.
summary: Make a baking soda paste. Apply the paste to the stain. Rinse away the baking soda. Repeat the treatment if necessary.