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# Homework Help: Kinetic Friction Homework Help

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We ban all bots. Hi there Reddit, I'm doing online homework for my college physics class and I don't know where I lost my textbook. Could someone help me figure out which formulas are to be used here? Here is the prompt:.

Unfortunately, when the crate reaches a point The crate immediately accelerates toward the ground, dragging the hapless crewman across the ice and toward the edge of the cliff. If we assume the ice is perfectly slick that is, no friction between the crewman and the ice once he slips and falls down , 1 at what speed will the crate hit the ground? Assume also that the rope is long enough to allow the crate to hit the ground before the crewman slides over the side of the cliff.

Assume no air friction. Please don't do my homework for me, I am allowed infinite attempts on this program. All I need to know is which formulas I should use. I must have forgotten what that stands for. Explain your thoughts about the problem and the steps you've taken so far. Provide those who help with as much information as possible. Demonstrate that you have already put in some thought and effort into solving the problem.

If you post an essay for editing or other help, create a Google doc or similar. Walls-of-text are almost impossible to edit with any effectiveness. Be sure your doc is accessible to those who will read your essay. Remove all personal information prior to posting. This subreddit is for help, pushes in the right direction, not answers. Think of this as an anonymous tutoring center.

With that in mind, the moderators have sole discretion to remove any post they feel violates that idea. Advertisements of any form. This includes asking for "likes," page views, or similar things. Posts tagged "urgent," "ASAP," "important," "due in an hour," etc. Requests for help with cheating, plagiarism, or other violations of academic integrity; violations of copyright or terms of use; or other illegal or unethical activities.

Keep in mind that we do not and will not have any sort of vetting procedure for responders. Accept answers at your own risk. We use automoderator for a few things. It may delete a post erroneously. If your post is missing and you're sure it's not a rule-breaker, send us a note and we'll look into the issue. We ban all bots. Physics help, forces and friction self. Figure shows an initially stationary block of mass m on a floor. This is because there is more friction between the carpet and the book than there is between the wood and the book.

One kind of friction or resistance is air resistance. Air resistance occurs between the surface of a falling object and the air that surrounds it and it also works to slow the rate at which the object falls.

Air resistance works with surface area, so the more surface area, the more air resistance. Think about when you drop two pieces of paper: The crumpled one falls faster because there is less air resistance acting on the paper. Friction can be useful. For example, friction between our shoes and the floor stop us from slipping and friction between tyres and the road stop cars from skidding.

Friction is sometimes unhelpful. For example, if you don't lubricate your bike regularly with oil, the friction in the chain and axles increases. Your bike will be noisy and difficult to pedal. When there is a lot of friction between moving parts, energy is lost to the surroundings as heat. Think of what happens when you rub your hands together quickly. The friction warms them up. When one object is sliding on another it starts to slow down due to friction.

This means it loses energy. However, the energy doesn't disappear. It changes from moving energy also call kinetic energy to heat energy. By rubbing them we generate friction and, therefore, heat. Friction is the resistance of motion when one object rubs against another. Anytime two objects rub against each other, they cause friction. Friction is also a great help to us. After all, we would all just be sliding around everywhere if there wasn't friction to keep us steady!

Friction is also used in car brakes, when we walk or climb a hill, in sandpaper, making a fire, and more. Friction has many uses in life. You light a match using friction. As you strike a match, friction creates enough heat to ignite a chemical compound in the match head that then burns the rest of the match head. Car brakes work because of friction. Shoes designed for some sports have special soles to use friction to your advantage. Football boots have studs to increase friction by sticking to cracks in the ground.

A violinist puts rosin on his bow to increase friction between the bow and the violin strings, therefore producing sound. However, friction can also be a real nuisance. If a door hinge squeaks, the noise is caused by friction. Cooked foods tend to stick to pans. Teflon on non-stick cookware reduces friction between the food and the pan, causing the food to slide. Competitive swimmers wear specially designed racing suits to reduce the friction between themselves and the water so that they can swim faster.

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Also useful for KS3. carnified friction homework help thanks to everything piledriving saick.

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Friction Example Problem – Physics Homework Help 3 This entry was posted on July 24, by Todd Helmenstine Friction is the resistance force generated between two bodies as they move across each other.