Please read the passage below:
Human beings are not born with special abilities but there is a belief that we are the most intelligent creatures in the world. We create different devices to make work easier by reducing the amount of force involved. For example, _________are used to slide heavy objects up.
Q1)Fill in the blank with the two words below:
1)Pulleys
2)Ramps
Q2)Can objects "slide up"?
English~~~urgent(20pt)
2015-03-31 4:51 am
回答 (3)
2015-03-31 8:29 am
✔ 最佳答案
(Q1)ramps
(Q2)Objects can slide up and slide over a slippery surface by a ramp (or slope) which is a gadget,an instrument, for reducing the amount of force involved as a machine does in Physics.Other answers are possible,please.
2015-03-31 07:37:08 補充：
Amendment:-We apply "a pulling force" to the object......Objects can-----
2015-03-31 10:15 am
Q1
The answer should be 2) Ramps
Q2
We can use ramp to slide a heavy object up over a slippery surface when we apply a pulling force to the object.
Credit should be given to 意見者：Duncan
A picture is worth a thousand words.
slide (intransitive verb) = move along a smooth surface
An object slides down over a slippery surface. (~ i.e. under gravity)
slide (transitive verb) = cause (a person or thing) to move across or down a surface while maintaining contact with it
An object is slid up the slippery surface of a ramp by a pulling force.
In physics, work done = force X distance
We use less force, but the object is moved over a longer distance.
A heavy load may be raised by pulling it along a sloping surface than by lifting it vertically.
2015-03-31 02:19:10 補充：
To TOMING88
Watch your language! ~ I mean the way you word it.
You always come up with half-baked ideas.
How can an object slide up over a slippery surface by a ramp (on its own)?
地心引力顛倒?
You should mention the pulling force applied to the object.
The answer should be 2) Ramps
Q2
We can use ramp to slide a heavy object up over a slippery surface when we apply a pulling force to the object.
Credit should be given to 意見者：Duncan
A picture is worth a thousand words.
slide (intransitive verb) = move along a smooth surface
An object slides down over a slippery surface. (~ i.e. under gravity)
slide (transitive verb) = cause (a person or thing) to move across or down a surface while maintaining contact with it
An object is slid up the slippery surface of a ramp by a pulling force.
In physics, work done = force X distance
We use less force, but the object is moved over a longer distance.
A heavy load may be raised by pulling it along a sloping surface than by lifting it vertically.
2015-03-31 02:19:10 補充：
To TOMING88
Watch your language! ~ I mean the way you word it.
You always come up with half-baked ideas.
How can an object slide up over a slippery surface by a ramp (on its own)?
地心引力顛倒?
You should mention the pulling force applied to the object.
參考: Oxford English Dictionary
2015-03-31 7:49 am
收錄日期: 2021-04-11 20:59:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150330000051KK00068