http://www.stormcam.org/friction-dash/
static and kinetic friction Help Needed Fast!?
I have no idea what to do with these few problems. If someone please help me. Explain things please. Problems: An object of 25 N N needs a 5.0 to start moving on a surface horizontal. What is the coefficient of static friction? NA cart 12 moves on a horizontal surface with a coefficient of kinetic friction of 0.20. What force of friction must be overcome to keep the object moving at constant speed? The following data are collected in a laboratory situation. Chart data and calculate the slope. How much is the slope of this graph? Normal Force (N) friction (N) ———— —————— 0 —- 0 —- 2.0 0.6 ————————— 6.0 1.8 —- ————————— —- ——— ————————- ————— — 9.0 2.7 – — 10.0 3.0 (all info is positive, I just had to give dashes so you can see the table)
<<A 25 N requires an object N of 5.0 to start moving on a horizontal surface. What the coefficient of static friction? >> Applied force – f = 0 f = frictional force = μN where μ = coefficient of friction N = normal force = mg = 25 Since N = 5 N applied force, then 5 – μ (25) = 0 Solving μ, μ = 5 / 25 = 0.20 "N 12 A basket is in motion on a horizontal surface with a coefficient of kinetic friction of 0.20. What force of friction must be overcome to keep the object moving at constant speed? > Using Newton's second law of motion F = ma where F = net force acting on the body M = body mass, an acceleration of the body = Since carriage moves at a constant speed, then acceleration is zero, hence the equation comes down to the work force, F = Net = 0 thus F – μN = 0 where μ = coefficient of friction = 0.20 N = normal force acting on the cart = 12 Therefore, F – 0.20 (12) = 0 F = 2.4 No. I will leave the problem of creating graphics for you to do yourself. Hope this helps.
Buybits portable, weighted friction dash mount and arm