How a helmet works.1. Vents usher in Verb 1. usher in - be a precursor of; "The fall of the Berlin Wall ushered in the post-Cold War period" inaugurate, introduce commence, lead off, start, begin - set in motion, cause to start; "The U.S. cool air (blue arrow ÓÀ:For a push-pull train model in China railway, see DJJ1. Blue Arrow is a British employment and recruitment agency. In 1987 the company was the centre of a financial scandal when employees of NatWest's investment arm, County NatWest, covered up a failed issue of ) and flush out warm air (pink arrow). 2. Foam liner is made of expanded polystyrene polystyrene (pŏl'ēstī`rēn), widely used plastic; it is a polymer of styrene. Polystyrene is a colorless, transparent thermoplastic that softens slightly above 100°C; (212°F;) and becomes a viscous liquid at around 185°C; (EPS (Encapsulated PostScript) A PostScript file format used to transfer a graphic image between applications and platforms. EPS files contain PostScript code as well as an optional preview image in TIFF, WMF, PICT or EPSI, the latter being an ASCII-only format. ), picnic-cooler foam. Upon impact, EPS crushes, absorbing energy and cushioning the head's impact. 3. Internal reinforcements brace brace: see drill. (character) brace - left brace or right brace. the EPS, allowing for larger air vents without any loss of overall strength. 4. For a helmet to work, it has to stay on. With the retention strap buckled, you shouldn't be able to get the helmet off your head by any combination of pulling or twisting. "Wearing the strap loose is a bad move," says Brian Sidwell of Bell Sports. 5. Interior padding Bits or characters that fill up unused portions of a data structure, such as a field, packet or frame. Typically, padding is done at the end of the structure to fill it up with data, with the padding usually consisting of 1 bits, blank characters or null characters. See null and bit stuffing. is a soft, hi-tech fabric that wicks sweat away from the head. 6. Adjustable fit system allows the rider to obtain a snug, hatlike fit. 7. A smooth microshell provides some impact resistance, and its slick surface allows the helmet to slide along the pavement instead of sticking, which helps prevent neck injury. WHY DON'T YOU WEAR A HELMET? Experts asked 332 U.S. kids ages 8 to 12 why they don't wear sports helmets. This bar graph breaks down the answers into percentages. Calculate the number of kids who don't feel cool wearing a helmet. 49% I only ride near home 43% Helmets are uncomfortable 32% I don't think I need it 29% I'm older now and in more control 28% I don't feel cool wearing a helmet 27% My parents don't make me SOURCE: NATIONAL SAFE KIDS CAMPAIGN Note: Table made from bar graph. |
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