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jumptheair
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Direction of frictional force! Help!
What is the direction of the frictional force for each question? OR is there not enough info given to answer the question?
1) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-19.gif
2) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-34.gif
3) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-17.gif
4) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-07.gif
5) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-01.gif
6) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-35.gif
frictional force concepts
1) Can't tell, because Fnet is negative but magnitude of weight and F is unknown?
2) Friction up, need it to keep block static against weight and F pushing down.
3) Friction to the right?, because it opposes the direction of motion?
4) Friction to the left, because friction is always perpendicular to the normal force?
5) Friction up, need it to keep block static against weight pushing down.
6) Can't tell, because the magnitude of weight and F is unknown.
I find the direction of frictional force really difficult to grasp.
Feel free to correct me at any point. Thanks
Homework Statement
What is the direction of the frictional force for each question? OR is there not enough info given to answer the question?
1) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-19.gif
2) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-34.gif
3) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-17.gif
4) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-07.gif
5) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-01.gif
6) http://www.learning.physics.dal.ca/library/Graphics/Gtype10/block01-35.gif
Homework Equations
frictional force concepts
The Attempt at a Solution
1) Can't tell, because Fnet is negative but magnitude of weight and F is unknown?
2) Friction up, need it to keep block static against weight and F pushing down.
3) Friction to the right?, because it opposes the direction of motion?
4) Friction to the left, because friction is always perpendicular to the normal force?
5) Friction up, need it to keep block static against weight pushing down.
6) Can't tell, because the magnitude of weight and F is unknown.
I find the direction of frictional force really difficult to grasp.
Feel free to correct me at any point. Thanks
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