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WorksheetsScience in Winter Olympic
Total questions: 6
Worksheet time: 6mins
When female skaters push off with one leg to attempt a jump, they apply a upward force nearly _____ times their body weight against the ice.
2 ( = 2 x 50kg x 10N/kg = 1000 N of force)
3 ( = 3 x 50kg x 10N/kg = 1500 N of force)
4 ( = 4 x 50kg x 10N/kg = 2000 N of force)
5 ( = 5 x 50kg x 10N/kg = 2500 N of force)
Modern skis are made of _______, fiberglass 玻璃纤维 and metal laminate
plastics 塑料
aluminium 铝
wood 木材
rubber 橡胶
In which Olympic winter sport, the surface of the ice is NOT smooth, instead it is dimpled with tiny drops of frozen water--or "pebbles".
Curling 冰壶
Ice hockey 冰球
Ice skating 滑冰
Laminated foam ski jumpsuits are VERY tightly regulated! Why? Because even small tweaks to the surface area can add lots of _______.
warmth
lift (upward force from air)
shine
In curling 冰壶, the sweepers brush the ice surface to create a layer of ______ to reduce _________ between the ice surface and the stone.
ice powder ... normal force
water ... normal force
ice powder ... friction
water ... friction
Ice is so slippery because
there is a very thin layer of water on the ice surface
the surface of ice is made very smooth
the surface of ice is made very flat
