F/N | 0.21 | 0.30 | 0.40 | 0.49 | 0.60 |
a/(m?s﹣2) | 0.10 | 0.21 | 0.29 | 0.41 | 0.49 |
①根據(jù)測(cè)得的數(shù)據(jù),在圖2中作出a﹣F圖象;
②對(duì)你作出的圖象進(jìn)行分析,可得出小車與長(zhǎng)木板之間的摩擦力Ff=N.
時(shí)刻t(s) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
離原點(diǎn)的位置x (m) | 0 | 0.5 | 2 | 4.5 | 8 | 12 | 16 | 20 |
瞬時(shí)速度v (m/s) | 0 | 1 | 2 | 3 | 4 | 4 | 4 | 4 |
則: