2 years, 1 month ago
about Physics
Provide examples of forces that act on an object from different angles
The examples should clarify the notion of resultant force
http://gcserevision101.files.wordpress.com/2009/02/centripetal-force1.jpg
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M$1 Answer
Example I:
A block sliding down an incline has the force of gravity pulling through the center of gravity (CG) toward the center of the Earth (ignoring minor local fluctuations in the gravitational field due to e.g. large iron ore deposits, etc.), friction operates at the interface between the block and the surface, along the direction opposite to the direction of travel, the normal force operates at right angle to the orientation of the surface and is equal in magnitude to the component of the gravitational force pointing from the block's CG to the nearest point of the surface on which the block slides.
Example II:
Person standing in elevator as it begins accelerating upward has the force of gravity pulling down, and the normal force pointing upward, where the normal force is greater than gravity to an extent that has the person accelerating upward exactly in time with the elevator's floor.
Example III:
Electron shooting out of an electron gun in the back of a CRT monitor has gravity pulling it toward the center of the Earth (negligible compared to other forces) and horizontal and vertical electrical forces directing it to the correct point on the monitor's glass face.
Let me know which others you may be interested in...
A block sliding down an incline has the force of gravity pulling through the center of gravity (CG) toward the center of the Earth (ignoring minor local fluctuations in the gravitational field due to e.g. large iron ore deposits, etc.), friction operates at the interface between the block and the surface, along the direction opposite to the direction of travel, the normal force operates at right angle to the orientation of the surface and is equal in magnitude to the component of the gravitational force pointing from the block's CG to the nearest point of the surface on which the block slides.
Example II:
Person standing in elevator as it begins accelerating upward has the force of gravity pulling down, and the normal force pointing upward, where the normal force is greater than gravity to an extent that has the person accelerating upward exactly in time with the elevator's floor.
Example III:
Electron shooting out of an electron gun in the back of a CRT monitor has gravity pulling it toward the center of the Earth (negligible compared to other forces) and horizontal and vertical electrical forces directing it to the correct point on the monitor's glass face.
Let me know which others you may be interested in...
source(s):
Physics education.
Physics education.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
By the way, the plane has two more forces acting on it. There is thrust from the engines, and drag from the atmosphere.
I didn't want to answer the question myself as a) don't know what you want to do with the answer, b) didn't want to take time to spell out stuff that I know you know, and c) I knew @opher would likely do a good job on it.
However, just want to throw in an idea... if this is for explaining to kids about forces, kicking a football could be an interesting example.
Anyway nice site with videos here:
http://www.videojug.com/interview/fun-science-how-to-divide-forces
wow Professor Gizmo is fun