功_WORK
Authored by zhuo kim
Physics
7th Grade
NGSS covered
Used 2+ times
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
功的定义是什么？
物体的速度变化
力对物体做的功
物体的质量变化
物体的体积变化
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在水平面上推一个箱子是机械功的例子吗？
是
不是
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如果一个物体在力的作用下没有移动，做功是多少？
正功
负功
零功
无法确定
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在重力作用下自由下落的物体做功吗？
是
不是
Tags
NGSS.HS-PS2-1
NGSS.HS-PS2-4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
哪几种情况是做功的？
A,B,C三种情况都没有做功
Tags
NGSS.HS-PS2-1
6.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
做功需要哪几种元素？
力（force）
距离（distance）
能量（energy）
速度（velocity）
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
对于做功的物体，力和力引起的距离方向需要一致吗？
需要
不需要
不确定，根据情况再判断
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