5 More Newtons Laws

5 More Newtons Laws - Chapter 5 Further Applications of...

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1 Chapter 5 Further Applications of Newton’s Laws
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2 5-1 Applications of Newton’s Laws Involving Friction Friction exists between all solid surfaces. When we try to slide an object across another surface, the microscopic bumps impede the motion . At the atomic level, the atoms on a bump of one surface come so close to the atoms of the other surface that electrical forces between the atoms can interact to form chemical bonds. Other causes might be steric hindrance (roughness of the surface).
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3 Applications of Newton’s Laws Involving Friction When a body is in motion along rough a surface, the force of kinetic friction acts opposite to the direction of the body’s velocity. The magnitude of the force of kinetic friction depends on the nature of the two sliding surfaces. For a given surface, experiment shows that the force is approximately proportional to the normal force between the two surfaces .
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4 Static Friction vs. Kinetic Friction
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5
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6
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7 Conceptual Example 5-2 To push or pull a sled? Your little sister wants a ride on her sled. If you are flat on the ground, will you exert less force if you push her or pull her? Assume the same angle θ in both cases.
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8 Example 5-4 Pulling against friction.
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