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4.3 Solving Friction Problems

4.3 Solving Friction Problems. Static Friction Problems If two or more objects are attached, you must overcome the combined maximum force of static friction to cause the object to move. Static friction can also be used to make an object move .

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4.3 Solving Friction Problems

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  1. 4.3 Solving Friction Problems Static Friction Problems • If two or more objects are attached, you must overcome the combined maximum force of static friction to cause the object to move. • Static friction can also be used to make an object move. When you take a step forward, the bottom of your shoe is at rest with respect to the ground. Your foot is not moving with the rest of your body. The reaction force of static friction by the ground pushes you forward, allowing you to move. SP # 1 p.173-174 – Static Friction on more than on object SP # 1 p.175 – Static Friction causing an object to move

  2. 4.3 Solving Friction Problems Kinetic Friction Problems • When an object slides across a surface, kinetic friction acts on the object opposite the direction of motion. • One common misconception is that kinetic friction always reduces the net force acting on the object. If a person pushes against a sliding object to stop it from sliding any farther, both the applied force and kinetic friction work together in the same direction increasing the net force acting on the object. SP # 1, 2 p.176

  3. 4.3 Homework Day 1 • Practice # 2 p.174 • Practice # 1, 2 p.175 • Practice # 1, 3 p.177 Day 2 • Questions # 2, 5, 7, 9, 10 p.178

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