配套习题- 杠杆（下） -【青果学苑】

1/5单选题

难度：

1.在探究杠杆平衡条件的实验中、若把如图所示两串钩码都向支点移动一格（每个钩码质量相等），那么（　　）

A	杠杆会在水平位置静止
B	杠杆右端下沉
C	杠杆左端下沉
D	无法确定

正确答案：Qg==

6K6+5q+P5Liq6ZKp56CB55qE6YeN5Yqb5Li6R++8jOavj+S4gOagvOeahOmVv+W6puS4ukzvvIzkuKTkuLLpkqnnoIHpg73lkJHmlK/ngrnnp7vliqjkuIDmoLzvvIzmlK/ngrnlt6bovrk9M0fDl0w9M0dM77yM5Y+z6L65PTJHw5cyTD00R0zvvJ4zR0zvvIzlj7PovrnlipvkuI7lipvoh4LnmoTkuZjnp6/lpKfkuo7lt6bovrnlipvkuI7lipvoh4LnmoTkuZjnp6/vvIzmnaDmnYblj7Pnq6/kuIvmsonvvJvmlYXpgIlC77yO

2/5单选题

难度：

2.如图是研究杠杆平衡条件的实验装置，要想使杠杆平衡，A处钩码应挂（　　）

A	1个
B	2个
C	3个
D	6个

正确答案：Qw==

5bem6L655Lik5Liq6ZKp56CB77yM5oiR5Lus5Y+v5Lul6K6k5Li65Yqo5Yqb5pivMk7vvIzliqjlipvoh4LkuLozY23vvIzlj7PovrnpmLvlipvoh4LkuLoyY23vvIzmoLnmja7lhazlvI9GPHN1Yj4xPC9zdWI+TDxzdWI+MTwvc3ViPj1GPHN1Yj4yPC9zdWI+TDxzdWI+Mjwvc3ViPuWPr+W+l++8mjxpbWcgd2lkdGg9MTgxIGhlaWdodD00NiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0UyLzNGL3JCQUNGRlVUdEJlaS1TRVlBQUFFOEJEUHNvUTQ4NC5wbmciPu+8jOaJgOS7peW6lOivpeaMgjPkuKrvvI7mlYXpgIlD77yO

3/5单选题

难度：

3.当两个小孩在跷跷板上处于水平平衡时，具备的条件是（　　）

A	他们的体重一定相等
B	他们的坐处到转轴的距离一定相等
C	他们对板的压力与板的受力面积的比值一定相等
D	他们对板的压力及其对支点的力臂的乘积一定相等

正确答案：RA==

6KaB5L2/6Le36Le35p2/5bmz6KGh77yM5b+F6aG75ruh6Laz5p2g5p2G55qE5bmz6KGh5p2h5Lu25Y2z5Yqo5Yqbw5fliqjlipvoh4I96Zi75Yqbw5fpmLvlipvoh4LvvJvogIzliqjlipvlkozpmLvlipvliIbliKvmmK/kuKTkuKrlsI/lranlr7nmnaDmnYbnmoTljovlipvvvIznlLHmnaDmnYblubPooaHnmoTmnaHku7blj6/lvpfvvIzku5bku6zopoHkvb/ot7fot7fmnb/lpITkuo7msLTlubPkvY3nva7vvIzliJnku5bku6zlr7nmnaDmnYbnmoTljovlipvlj4rlhbblr7nlupTlipvoh4LnmoTkuZjnp6/kuIDlrpropoHnm7jnrYnvvI7mlYXpgIkgRO+8jg==

4/5单选题

难度：

4.

用扳手拧生锈的螺母时，工人师傅常在扳手柄上再套一节管子，这样就比较容易地拧下螺母．这是因为（　　）

A	套上的管子较重，可以省些力
B	套上的管子较粗，使用比较方便
C	套上管子后可以用较大的力
D	套上管子后增大了力臂

正确答案：RA==

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

5/5单选题

难度：

5.一根轻质杠杆，左右分别挂上200N和300N的物体时恰好平衡，若在两边分别加挂50N的砝码，则杠杆（　　）

A	仍然平衡
B	左边下沉
C	右边下沉
D	无法判断

正确答案：Qg==

55Sx5p2g5p2G55qE5bmz6KGh5p2h5Lu25Y+v5b6X77yMRjxzdWI+MTwvc3ViPu+8mkY8c3ViPjI8L3N1Yj49MjAwTu+8mjMwME49Mu+8mjPvvIzmiYDku6XvvIzlipvoh4LkuYvmr5RMPHN1Yj4xPC9zdWI+77yaTDxzdWI+Mjwvc3ViPj0z77yaMu+8jOW3pui+ueeahOWKm+iHgumVv++8juW9k+S4pOi+ueWQjOaXtuaMgjUwTueahOegneeggeaXtu+8jEY8c3ViPjE8L3N1Yj5MPHN1Yj4xPC9zdWI+77yeRjxzdWI+Mjwvc3ViPkw8c3ViPjI8L3N1Yj7vvIzlm6DmraTlt6bovrnkvJrkuIvmsonvvI7mlYXpgIlC77yO