7. Friction, Inclines, Systems

Kinetic Friction

Friction & Newton's Laws Part 4 Sample Problem

Pushing Down on a Block with Friction

Block A, mass <math display="inline"><mrow><mn>250</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">g</mi></mrow></math>, sits on top of block B, mass <math display="inline"><mrow><mn>2.0</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">kg</mi></mrow></math>. The coefficients of static and kinetic friction between blocks A and B are 0.34 and 0.23, respectively. Block B sits on a frictionless surface. What is the maximum horizontal force that can be applied to block B, without block A slipping?

Anderson Video - Sliding with Friction

Friction & Newton's Laws Part 1 Coefficient Intro

Anderson Video - Friction and Cars

Pushing a 10-kg toolbox across the floor, you find that the box moves at a constant speed when you push horizontally with a force of 39 N. What is the coefficient of kinetic friction between the floor and the toolbox?

A 45.0-kg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, and the crate just begins to move when your force exceeds 313 N. Then you must reduce your push to 208 N to keep it moving at a steady 25.0 cm/s. (b) What push must you exert to give it an acceleration of 1.10 m/s2? 

Frictional Forces: Static and Kinetic

Newton's 2nd Law (2 of 21) Calculate Acceleration with Friction, Net Force Horizontal

Kinetic Friction Problems

You push on a 3-kg box to give it an initial speed of 5 m/s across a floor. If μk = 0.3, how far does the box travel before coming to a stop?

A 45.0-kg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, and the crate just begins to move when your force exceeds 313 N. Then you must reduce your push to 208 N to keep it moving at a steady 25.0 cm/s. (a) What are the coefficients of static and kinetic friction between the crate and the floor? 

Kinetic Friction Equation

Friction & Newton's Laws Part 3 Sample Problem

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