体育课上，王强同学以相同姿势分别沿着杆和绳匀速向上爬，若杆比绳子光滑一些，则他爬杆受到的摩擦力______爬绳受到的摩擦力（选填“大于”、“等于”或“小于”）．
由题意知：由于王强同学以相同姿势分别沿着杆和绳匀速向上爬，
那么在竖直方向均受到平衡力的作用：重力和摩擦力，
由二力平衡的条件知：他所受的重力和摩擦力，大小相等，方向相反，且在同一条直线上；
因此，他爬杆受到的摩擦力和爬绳受到的摩擦力都等于他受到的重力；
故填：等于．
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| Today is Sunday. It's nine o'clock. Mr. Wang's family are all 1 . Mrs. Wang is watching TV. She is watching TV shopping. She wants to buy a ___2___ on TV, because she likes taking photos. Mr. Wang is ____3___ a newspaper. There is some ____4___ about Zhao Benshan, his favorite ___5____. Their son,Wang Hai,is talking on the phone. He is ____6____ up one of his friends. He wants to go to the __7____ to see animals with his friends. Their daughter, Wang Jing, is playing with her Teddy Bear. She is only four years old. Look! An ___8____ is in her hand. It is her favorite fruit. What's that over there? Oh, it's a bird. It's ___9__ in the cage ( 笼子). Please be ___10___. Don't wake it up( 弄醒). | |||||
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