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A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a 4.00-kg textbook 1.00 m across...Question
A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a
4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work
done by friction on the textbook.
4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work
done by friction on the textbook.
Answers
bobpursley
workapplied=39cosine22.6*1m=
work doneonbook= 1/2* 4 *1.75^2
work friction= work applied-work done
work doneonbook= 1/2* 4 *1.75^2
work friction= work applied-work done
drwls
39 cos22.6*(1 meter) is the work done by the force, in joules. Subtract the final kinetic energy from that. That will be the work done against friction.
drwls
The work done. BY friction is negative