One of my professors gave us this multiple choice question on a test:
38. Consider rock and soil. How would the gravitational force pulling down on the rock and soil that is sliding down a slope be affected, if there were a change in the slope angle?
a) steeper slope, more pull
b) steeper slope, less pull
c) slope has no affect on gravitational pull
d) slope can either be steeper or less steeper, but other factors must be considered
I chose C but the professor said the answer was A. How is that correct if the gravitational force is always the same on earth no matter what.
Does gravitational force increase as an object falls?
2010-06-14 6:53 pm
回答 (7)
2010-06-14 9:16 pm
✔ 最佳答案
Your professor is an idiot.The steepness of the slope has absolutely no effect on the strength (pull) of gravity. What a steeper slope *does* do is reduce the amount of friction so that an object will slide faster with the same force of gravitational pull.
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2016-10-21 1:48 pm
IANAPM (i'm not a physics considerable), yet ... gravitational tension isn't continually a similar. it varies proportionately to the mass of the two gadgets, which to that end may be the rock + soil sliding, and the earth. i don't see how the mass of the two of those is changing ... additionally, GF varies inversely to the gap between the gadgets ... so ... does that recommend that the GF tension could shrink with the attitude of the slope, because of the fact the "distance" between the rock+airborne dirt and airborne dirt and mud and the main suitable resting place on the backside of the slope will advance? sturdy query. i seem forward to somebody that knows extra advantageous than i answering.
2010-06-15 3:45 pm
i didn't give anyone a thumbs down...from what i saw the answers looked correct
but gravitation force is essentially a constant...the slope would would only determine the effect the gravity would have on the rock i.e. sit still or roll.
but gravitation force is essentially a constant...the slope would would only determine the effect the gravity would have on the rock i.e. sit still or roll.
2010-06-14 10:12 pm
The professor should have been more clear and stated, "pull in the direction of movement" Gravitational force makes the same "pull" straight down but, the force moving the rocks is G*sin(angle).
2010-06-14 10:06 pm
The gravitational force on the object is not affected by the slope.
However, the effective pulling force on the object is affected by the slope. Gravitational force is vertical to the object. When an object is pulled down a slope, there are both horizontal and vertical displacement. The horizontal displacement uses some of the potential energy of the falling object which is originated from the gravitational pull.
Therefore the less the steepness of slope, the less is the horizontal displacement and thus less enrgy loss in friction.
However, the effective pulling force on the object is affected by the slope. Gravitational force is vertical to the object. When an object is pulled down a slope, there are both horizontal and vertical displacement. The horizontal displacement uses some of the potential energy of the falling object which is originated from the gravitational pull.
Therefore the less the steepness of slope, the less is the horizontal displacement and thus less enrgy loss in friction.
2010-06-14 8:10 pm
a) because e=mc2. in other words, the faster an object goes the more mass is added to the object which makes it more heavier.
參考: watching sci trek a tv show on the science channal
2010-06-14 7:06 pm
C there is less friction interfering with the gravitational pull, but A is also technically correct, because slope does not impact gravity
參考: ..
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