1.某杠杆的动力臂是阻力臂的5倍,阻力为200牛,则杠杆平衡时,动力为_______牛;若另一杠杆的阻力臂是动力臂的5倍.阻力仍为200牛,则杠杆平衡时,动力为_______牛.2.若杠杆左端偏高,那么左端螺母应向_______调节,使杠杆在__________(选填"左端"或"右端")平衡.3.OA是轻制杠杆,已知OB=2AB,B点所挂物体的重力为6牛,A端用力F竖直向上拉着,杠杆处于静止状态,则力F的大小为_____牛.当力F向左倾斜时,为使杠杆仍保持静止,则力F的大小需_______(选填"增大"."不变"或"减小").图|||.↑|o__________b__||```````````||```````````||```````````¤图| |...........................↑ |o__________b__| |``````````````````| |``````````````````| |``````````````````¤
问题描述：
1.某杠杆的动力臂是阻力臂的5倍,阻力为200牛,则杠杆平衡时,动力为_______牛;若另一杠杆的阻力臂是动力臂的5倍.阻力仍为200牛,则杠杆平衡时,动力为_______牛.
2.若杠杆左端偏高,那么左端螺母应向_______调节,使杠杆在__________(选填"左端"或"右端")平衡.
3.OA是轻制杠杆,已知OB=2AB,B点所挂物体的重力为6牛,A端用力F竖直向上拉着,杠杆处于静止状态,则力F的大小为_____牛.当力F向左倾斜时,为使杠杆仍保持静止,则力F的大小需_______(选填"增大"."不变"或"减小").
图
|
|
|.↑
|o__________b__|
|```````````|
|```````````|
|```````````¤
图
|
|...........................↑
|o__________b__|
|``````````````````|
|``````````````````|
|``````````````````¤
答
1、40 1000
2、左端
3、
答
（l1F1=l2*F2 5*F=1*200）F=40N （同理第二空为）1000N
左 （第二空应该是）水平
（l1F1=l2*F2 3*F＝2*6）F＝4N （动力臂减小）增大