apc ch 6 (2012) friction - jay mathy science wiki - homech+...xvii.maxvelocityonasurfacew/fc ! ! ! !...
TRANSCRIPT
Friction Factoids
The mass m2 slides 1.00 m down the incline in 4 seconds. Determine (a) The acceleration of each mass (b) The coefficient of kinetic friction
A B vi
vfΔθ
vf
-vi
Δv
r r
DSHS AP Physics C Mathy Name: Forces+ Newton’s Laws Chapter 6 Complex Forces & Circular Motion
IV. Core Problem 1.0 V. 2nd Core Problem 2.0 A 1500 N crate is being pushed across a level floor at a constant speed by a force F of 600 N at an angle of 20° below the horizontal as shown in the figure.
a) What is the coefficient of kinetic friction between the crate and the floor?
VI. Limiting Angle of Repose VII. Drag Force ΣFx= ΣFy= VIII. Terminal Velocity IX. Centripetal Acceleration Vectorial Proof
2 Types of Friction Static Kinetic
Friction Equation Coefficient of friction (µ)
X. Centripetal Accel Equation XI.Speed and periodicity XII. Centripetal Force
XIII. Circ Motion Vectorial Summary XIV. Scenarion 1 Object on a String w/ Tension 1. 2. 3. 4. 5. XV. Scenario 2 Object inside a Track XVI Scenarion 3 Object on top of curve
XVII. Max velocity on a surface w/ Fc XVIII. Min velocity to complete a curve What is the maximum velocity needed to keep the 200kg car on the curve? The curves radius is 10 m and the coefficient of friction is 0.10
IXX. Conical Pendulum XX. Mega Inclines XXI Banked Curves
ΣFx= ΣFy=
XX Mega Inclines & FBD
Masses m1 = 6.00 kg , m2 = 1.00 kg, and m3=2kg are connected by a light string that passes over two frictionless pulleys. As shown in the diagram, m2 is held at rest on the floor and m3 rests on a fixed incline of angle 40 degrees. The surfaces have a coefficient of friction of m= 0.40 .The masses are released from rest and all masses accelerate in the direction of m1 down the incline. Determine (a) The acceleration of each mass (b) the tension in the string. XXI Banked Curves A car of mass m moves at a constant speed of 30 m/s around a banked circular track of radius r=190m. If the friction force is negligible (very icy!) what angle can prevent the car from sliding?