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| *Vultures Knob>>>Bike Pedals |
Argh im confused please help on this question!!!? |
bob challenged his sis jen to a problem:use all four types of friction to get home from school. He reminded her that the four types of friction are sliding, rolling,static,fluid. Jen hopped on her bicycle after school. wat a perfect day to be cyclin-the sun was shining, there was a slight breeze in the air, and the temperature was a comfortable 27C. Jen got on the bike path and began pedaling as fast as she could. the wheels of the bicycle were turning at a furious pace and the faster jenny pedaled, the stronger the breezy air blew on her face. all of a sudden, she came across a tree branch that had fallen on the path. jen slammed on her brakes and stopped just in time to avoid hitting the fallen branch. that was a close call she got off of her bike and tried to push the branch to the side of the path so that others would not get hurt, but it too heavy to budge. jen continued on her journey and got home safely in record time.did she meet the requirements? please give examples. sounds good to me YES. Rolling friction --> bike tires on ground Sliding friction --> slamming the brakes on Static friction --> the tree limb which wouldn't budge Fluid friction --> the breeze blowing in her face yes... sliding: this occured when she hit the brakes on the bike. hitting the brakes squeezes a little thingy that rubs outside of the wheel on both sides to slow it down. rolling: when she was riding the bike normally the tires have a small amount of friction with the road from the two interacting with each other. static: She couldn't move the try because of static friction. This force is usually higher than sliding friction for an object, it's harder to get something moving initially than keep it moving. Fluid: air is really a fluid, the air resistance when she gained speed is nothing more than fluid friction of the air against her body. She met the the rolling requirement because the wheels on the bike were rolling. By slamming on her brakes she created friction and was sliding as a, would slide slightly when brakes are suddenly applied, she was static when she stopped the bike, she was fluid because she was in motion-continously moving at a fast speed on the bike. |
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