질문
문제 이해
38.
For example, if you rub your hands together quickly,
they will get warmer.
Friction is a force between two surfaces that are sliding, or
trying to slide, across each other. For example, when you try
to push a book along the floor, friction makes this difficult.
Friction always works in the direction opposite to the direction
in which the object is moving, or trying to move. So, friction
always slows a moving object down. ( ① ) The amount of
friction depends on the surface materials. ( ② ) The rougher
the surface is, the more friction is produced. ( ③ ) Friction
also produces heat. ( ④ ) Friction can be a useful force
because it prevents our shoes slipping on the floor when we
walk and stops car tires skidding on the road. ( ⑤ ) When
you walk, friction □□□□□.
풀이
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Quisque aliquet viverra orci et mollis. Pellentesque neque mauris, bibendum sed auctor id, vulputate eu orci. Ut egestas laoreet sem, sit amet consequat eros malesuada quis. Etiam tempus dictum lacus, vel ullamcorper nisi laoreet at. Donec eu mauris non arcu volutpat interdum. Nulla sagittis erat ut auctor sollicitudin. Pellentesque vulputate feugiat eleifend. Quisque ullamcorper venenatis leo vel gravida. Nam eu semper leo.
유사 문제와 풀이
2