Solving a Lab w/ Friction: Need Help!

[fishfish]

Homework Statement

Hi, I'm new the PF and I was wondering if someone could help me with my lab.

This was the basic set up of our lab, with one mass being pulled by another mass up an incline. The ramp was placed on a desk while mass B was left to fall towards the ground. What we were supposed to do was dertermine the coefficient of friction of the material ( coloured red ) under mass A for each different run that we did with different materials. I don't really know where to start on this lab, other than finding the acceleration of the system, but what I'm really troubled with is having to find the force of friction on the incline...

For the first run...

mass of block A= 0.185 kg
mass of block B = 0.143 kg
dots on tickertape= 84 dots
time ( estimated from tickertape) = 1.4s

Homework Equations

∑F= Fg_y _ Fg_x(paralell)
= m_yg_y + m_xgsinθ

The Attempt at a Solution

∑F= m_yg_y + m_xgsinθ
= (0.143kg)(9.8m/s²) + (0.185kg)(-9.8sin16°)
= 0.9 m/s²



And then after this I don't know where to go...

 

[tiny-tim]

fishy welcome to pf!

hi fishfish! fishy welcome to pf!

∑F= m_yg_y + m_xgsinθ
= (0.143kg)(9.8m/s²) + (0.185kg)(-9.8sin16°)
= 0.9 m/s²

(i assume you're intending to use F = ma to find the acceleration)

you haven't included the formula for the friction force, nor the total mass

 

[tomcue]

I would suggest starting by reviewing the concept of friction and how it relates to the forces acting on the objects in your lab setup. It may also be helpful to review the equations and principles of Newton's laws of motion. From there, you can begin to analyze the forces acting on the system and determine the force of friction on the incline. You may also want to consider using a force sensor or other equipment to measure the forces more accurately. Additionally, it may be helpful to consult with your lab instructor or classmates for guidance and assistance. Good luck with your lab!