Thread: phisics, coefficient of static friction

i think it involves the pythagorem theorem but not really sure how to apply it. any help would be much appreciated.

"Mass of wood block without any weight = 5.0 kg; g = 9.8 m/s2"

"It was observed that the spring scale reached a force of 24.0 N to get the block moving from rest. Calculate the coefficient of static friction between the wood block and the table."

Originally Posted by 14041471

i think it involves the pythagorem theorem but not really sure how to apply it. any help would be much appreciated.

"Mass of wood block without any weight = 5.0 kg; g = 9.8 m/s2"

"It was observed that the spring scale reached a force of 24.0 N to get the block moving from rest. Calculate the coefficient of static friction between the wood block and the table."

is the block on a horizontal surface?

is the applied force parallel to the surface on which the block rests?

"A block of wood is dragged across a surface by a spring scale. The scale records the force as mass is added to the top of the block."

i didnt post that part of the question in the last post. i dont know if that helps, but i dont know the awnser to your question. i was given this question to solve.

why, then, did you mention the Pythagorean theorem?

Originally Posted by 14041471

i think it involves the pythagorem theorem but not really sure how to apply it. any help would be much appreciated.

"Mass of wood block without any weight = 5.0 kg; g = 9.8 m/s2"

"It was observed that the spring scale reached a force of 24.0 N to get the block moving from rest. Calculate the coefficient of static friction between the wood block and the table."

i believe were talking about applied force

use the frictional force equation;

mu*m*g=mu*5.0*9.8=49mu=24=24/49=0.489

plot the values and you will see

i need to find the static friction force between the wood and surface, is that what you ment?

Originally Posted by 14041471

i need to find the static friction force between the wood and surface, is that what you ment?

The block is sliding (I assume at constant velocity) therefore where is the normal reaction force.

Getting the value of is simple and you're given the value of (the reading of the spring scale). Substitute the values and solve for .