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Old Aug 14th 2008, 07:31 AM   #1
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pls help with this Q. force up inclined hill

a 100 kg trollley is being pushed up a rough 30degree incline by a constant force, F. the frictional force Ft between the incline and the trolley is 110N. determine the value of F that will move the trolley up the incline at a constant velocity of 5ms^1?

thanks my 1st time on this forum.
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Old Aug 14th 2008, 07:57 AM   #2
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Originally Posted by usagi View Post
a 100 kg trollley is being pushed up a rough 30degree incline by a constant force, F. the frictional force Ft between the incline and the trolley is 110N. determine the value of F that will move the trolley up the incline at a constant velocity of 5ms^1?

thanks my 1st time on this forum.
I can't do much unless I know what direction the applied force is in. For example, the two common directions are directly up the slope or horizontally.

The general description of how to attack this problem is the following: set up a coordinate system such that +x is up (or down) the slope and +y is perpendicular to the slope and upward (in the direction of the normal force.) Now resolve your forces into components in these directions. Now apply Newton's 2nd Law in both coordinate directions. Actually in this case all you will need is the x direction.

If you need more help than this, let me know the direction of F and we'll get into more detail.

-Dan
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