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A 135-N block resting on a rough horizontal table is pulled by a horizontal wire. The
pull gradually increases until the block begins to move and continues to increase
thereafter. The figure below shows a graph of the friction force on this block as a
function of the pull.
a. Identify the regions of the graph where static and kinetic friction occur.
b. Find the coefficients of static and kinetic friction between the block and the table.
c. Why does the graph slant upward in the first part but then level out?
A 0.600-𝑘𝑔 particle has a speed of 2.00 𝑚/𝑠 at point 𝐴 and kinetic energy of 7.50 𝐽 at point 𝐵. What is a) its kinetic energy at 𝐴? b) its speed at 𝐵? c) the total work done on the particle as it moves from 𝐴 to 𝐵?
A 15.0-kg block is dragged over a rough, horizontal surface by a 70.0-N force acting at 20.0 o above the horizontal. The block is displaced at 5.00 m, and the coefficient of kinetic friction is 0.300. Find the work done by a) the 70-𝑁 force, b) the normal force, and c) the force of gravity, d) What is the energy loss due to friction? e) Find the total change in the block’s kinetic energy.
A box with a mass of 50 kg is shoved by a man across the floor with a force of 100 N through a distance of 5 m. He then shoves it up a 300 inclined to a height of 1 m by exerting a force equal to 3/5 its weight. What is the final potential energy of the box?
A body a mass 𝑡𝑒𝑛 𝑠𝑙𝑢𝑔𝑠 is thrown with a velocity of 6𝑓𝑡/𝑠. along a horizontal floor. The coefficient of friction between the body and the floor 𝑖𝑠 0.20. Find a) Kinetics Energy and velocity of the body after traveling a distance of 2𝑓𝑡. b) How far will the body travel before it comes to rest?
A man weighing120𝑙𝑏𝑠, climb up a stairway inclined 45° consisting of 20 𝑠𝑡𝑒𝑝𝑠 each step 6" high. What is his potential energy at the top?
What weights can a 6 Hp engine pulls along a level road at 15 mi/hr if
the coefficient of friction between the weight and the road is 0.2?
An 30 kg object from rest was pulled horizontally by a pulling force 100 N applied along the direction of displacement line. The coefficient of kinetic friction between the surface and the object is 0.20 and the object was displaced at a distance of 40 meters. How much power consumed during the travel?
Using component method of getting the resultant of vectors, find the resultant of the following vectors: 7N along the positive x axis, 5N making an angle of 35o with the x axis, and 3N, 36o South of West.
