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Static Friction

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الكلية كلية التربية للعلوم الصرفة     القسم قسم الفيزياء     المرحلة 1
أستاذ المادة فؤاد عطية مجيد       06/03/2019 13:28:44
Opposite to the direction of the motion
? ???? depends on the nature of the materials, ???? independent of ?? over wide range
? Friction force on each interacting body is opposite in direction to the motion of that body relative to the other.
Static Friction
Frictional forces also acts between surfaces that at rest (no relative motion)
? Object at the rest require a non-zero force to start them moving
???????????
???? coefficient of static friction
? Force of static friction can have any magnitude between zero (when there is no other force parallel to the surface) up to a maximum due to ??????. Equality sign holds when motion is about to start
? Proportional to normal force
5.13 Problem- Solving Strategy
1. Draw a diagram indicating all key features in the problem
2. Draw one or more free body diagram for the objects. For the chosen object include all the forces acting on it. Do not include any internal forces. Do not include any forces exerted by the body on some other body
3. Select a coordinates system and show it in the free- body diagram. Determine components of the forces with reference to these axis as x-axis can choose different reference frame for each body all must be “inertial”
If there are geometrical relationship between two or more bodies- relate these algebraically
5. Write down Newton’s Eq. of motion for each body and solve for unknown.
???=????

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