- #1
isukatphysics69
- 453
- 8
I have already solved this one weeks ago, and i have a test Tuesday so i was reviewing these problems.
I understand everything when solving with 60N as the force.. but then when i changed the force to 20N,
i had to use the coefficient of kinetic friction to get the correct answer.. how exactly would i know if the block is moving just by changing the force from 60N to 20N? There should be a certain threshold where between x and y Newtons of force the block stays stationary and should only use static friction coefficient..I completely forget how i should figure on an exam whether i should use kinetic or not given this situation.. i am asking conceptually here how should i know?
Homework Equations
f=ma
The Attempt at a Solution
asking conceptually here. have already solved