翻译和例句：
in size. They are more affected (影响) by surface forces, like friction (摩擦力) and wind, than by gravity ……
there is no friction (摩擦力)! It’s greener because it uses less energy. The train can carry up...), according to China Daily. So there is no friction (摩擦力)! It’s greener because it uses less ……
Q: Why can a boiled egg spin (旋转) in a vertical (垂直的) position?A: American and Japanese scientists carried out an analysis of the forces at work on a spinning egg.They said that the friction (摩擦力 ……
is smooth (光滑的). When they went downhill, there was little friction (摩擦力).Horse hair is smooth (光滑的). When they went downhill, there was little friction (摩擦力).However, going uphill was against ……
forever until some other force acts on it. On Earth, fidget spinners always experience friction (摩擦力 ……
unless some other force acts on it. On Earth, fidget spinners always experience friction (摩擦力) when ……
(摩擦力) between the lid and the can.The marbles greatly reduce the friction (摩擦力) between the lid ……
) as a motor (发动机). They gather energy in the fingers and arms. The friction (摩擦力) between the thumb... muscles (肌肉) as a motor (发动机). They gather energy in the fingers and arms. The friction (摩擦力) between ……
far and move too fast. The fuzz creates drag (阻力) in the air and friction (摩擦力) against the court... far and move too fast. The fuzz creates drag (阻力) in the air and friction (摩擦力) against the court ……
)! Horse hair is smooth (光滑的). When they went downhill, there was little friction (摩擦力).The earliest... (底部)! Horse hair is smooth (光滑的). When they went downhill, there was little friction (摩擦力).However ……
(摩擦力) between the ball and the table slows it down. The ball’s center of mass (质心) also plays a role... the ball on the table, and friction (摩擦力) between the ball and the table slows it down. The ball’s center ……
friction (摩擦力) to slow them down. Elon Musk, founder (创始人) of US space company SpaceX... be very little friction (摩擦力) to slow them down. ……
the mud increased friction (摩擦力). This makes it more difficult for the ball to slip out of (脱离... the mud increased friction (摩擦力). This makes it more difficult for the ball to slip out of (脱离 ……
to supermarkets to collect waste cardboard and paper, and we also did tests to reduce friction (摩擦力) so ……
摘自： We made it![BY ZHANG ANYU, 21ST CENTURY TEENS STAFF, 21世纪学生英文报·初二版]
and paper, and we also did tests to reduce friction (摩擦力) so that our cart could run faster.” When the cart ……
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