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:
Q2)Can objects "slide up"?
- TOMING88Lv 76 年前最愛解答
(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-----
- GodfreyLv 76 年前
The answer should be 2) Ramps
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：
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)?
You should mention the pulling force applied to the object.資料來源： Oxford English Dictionary