Concept Explanation:

An explanation of the Normal Force and the coefficient of friction.

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A block sliding along a surface:

A 4.5kg wooden block is pulled at constant velocity along a uniform wooden floor. The coefficient of friction between the block and the floor is 0.20. What is the magnitude of the force that is pulling the block if it acts at 45 degrees to the horizontal.

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A Harder problem with Tension

Once we go through the easier problems in a section, we move on to solutions for harder problems. We want you to be successful at doing these harder problems because it will be the hard ones that may make the difference between an A and a B in your course.  

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Classic Problem: Finding the acceleration of a system

This problem very frequently shows up on tests. Two unequal masses are suspended by a string that passes over a frictionless massless pulley. Find the acceleration of the masses.     

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