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Worksheets科学小挑战4
Total questions: 16
Worksheet time: 8mins
什么是力？
What is the meaning of force?
拉力施加在物体上
The pulling effect of an object
推力施加在物体上
The pushing effect of an object
推力和拉里施加在物体上
The pulling and pushing effect of an object
物体的移动而产生一种力量
哪项显示活动涉及推力？
Which of the following activities involves a pushing force?
上图显示一个男人正在进行活动。
Diagram above shows a man carrying out an activity.
什么力涉及这个活动？
What is the force involved in this activity?
推力 Pulling force
拉力 Pushing force
地心引力 Gravity force
压缩力 Compressing force
哪项的活动涉及拉力和推力？
Which of the following activities involves pushing and pulling forces?
打排球 Playing volleyball
放风筝 Flying a kite
推轮椅 Pushing a wheelchair
为自行车的轮胎填气 Pumping bicycle tyres
上图显示 球员在踢球。
Diagram above shows a player is kicking a ball.
当球被踢后， 球涉及什么力使球移动？、
What makes the ball move after being kicked?
脚力 Leg force
推力 Pushing force
拉力 Pulling force
摩擦力 Frictional force
下列哪项活动涉及力能改变物体的形状？
Which of the following actions of force causes a change in shape?
在操场骑自行车 Cycling in the field
球在地板上滚动 Rolling a ball on the floor
划船 Rowing a boat
吹气球 Blowing a balloon
下列哪项活动显示力能改变物体的形状？
Which of the following shows that a force can change the shape of an object?
上图显示球在移动。
Diagram above shows that a ball is moving.
如果球员从相反的方向踢那个球， 球将是什么情况？
What will happen if a player kicks the ball form the opposite direction?
球j将会静止 The ball will stop
球将会改变形状 The ball will change its shape
球将会慢慢地移动 The ball will move slowly
球将会改变移动的方向
The ball will change its direction of movement
什么是摩擦力？
What is the meant by frictional force?
一种力涉及阻碍物体的移动
An effort to resist movement
一种力涉及改变物体
A force to change an object
一种力涉及当两个物体的表面互相接触时所产生的阻碍物体移动
The force produced when two surfaces are in contact with each other
推力和拉力施加在物体上
Pulling and pushing that is applied on an object
下列哪项是说明摩擦力的例子？
Which of the following examples explains the meaning of frictional force?
铝罐被挤压后而变成扁铝罐
An aluminium can is dented after being squeezed
自行车的踩踏板被踏得很快
A pedaled bicycle moves faster
一个盒子在草地上被拉着很难移动
A box that is pushed on the grass is difficult to move
一个球当被踢时而改变移动的方向
A rolling ball changes its direction when kicked
一组学生在进行实验。 他们在四种不同表面上滚动玻璃弹珠。 图上显示实验的结果。
A group of pupils carried out an investigation by rolling a marble on four different surfaces. Diagram above shew the results of the investigation.
哪项是 表面 R, S 和 T ？
What surfaces are R, S and T ?
R - 马尼拉卡Manila card S - 砂纸 Sandpaper
T - 玻璃Glass
R - 砂纸 Sandpaper S - 马尼拉卡Manila card
T - 玻璃Glass
R - 砂纸 Sandpaper S - 玻璃 Glass
T - 马尼拉卡 Manila card
R - 玻璃 Glass S - 砂纸 Sandpaper
T - 马尼拉卡 Manila card
实验里， 一辆玩具车在不同的表面上行走。 哪一种表面能使玩具车停止最慢？
In an investigation , a toy car is pushed on different surfaces. Which surface causes the toy car to stop the latest?
玻璃表面 Glass surface
石灰表面 Cement surface
草地表面 Grass surface
地毯表面 Carpeted surface
物体的表面越 ， 所产生的摩擦力越 。
A surface produces frictional force
粗糙 rough , 小 less
粗糙 rough , 大 more
光滑 smooth, 大 more
光滑 smooth , 没有 non
哪项活动显示摩擦力的益处？
Which of the following activities shows an advantages of frictional force?
鞋子底部的纹路磨损 Wearing out the tread on shoe soles
磨刀 Sharpening a knife
使物体难以移动 Slowing down movements
笔尖变钝 Making a pencil blunt
图上显示工人在推盒子而面对困难。
Diagram above shows a worker is having a problem in pushing a box.
下列哪项说明是最容易的方法来推动盒子？
Which of the following is the easiest way to push the box?
用绳子来拉动盒子
Pull the box by using a string
撒一些沙在地上的表面
Scatter some sand on the surface of the floor
撒一些盐在地上的表面
Scatter some salt on the surface of the floor
放滚杠在盒子下面
Put the rollers under the box
上图显示门的合页
Diagram above shows a door hinge.
下列哪项可以帮们的合页减少摩擦力？
Which of the following can reduce the friction at the door hinge?
水 water
轮子 Wheel
润滑油 Oil
爽身粉 Talcum powder
