Zhang Jun students in "explore the size of friction more which factors." In the experiment of "exploring which factors are related to the size of friction force", Zhang Jun adopted the following experimental methods: put the long board on the horizontal table, and the wood (2) does the long board have to move in a uniform and straight line in the experiment I'm sorry I can't upload the picture, but please make sure to analyze it for me

Zhang Jun students in "explore the size of friction more which factors." In the experiment of "exploring which factors are related to the size of friction force", Zhang Jun adopted the following experimental methods: put the long board on the horizontal table, and the wood (2) does the long board have to move in a uniform and straight line in the experiment I'm sorry I can't upload the picture, but please make sure to analyze it for me

In the experiment of "exploring which factors are related to the size of friction force", Zhang Jun adopted the following experimental methods: (1) put the long board on the horizontal table, and the wood [put the block on the board, pull the block with a spring dynamometer to move at a constant speed, read out the force F at this time, and record it in the pre designed table] (2) experiment