5 More Newtons Laws-1

5 More Newtons Laws-1 - 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 Friction When we try to slide an object across another surface, the microscopic bumps impede the motion . When a body is in motion along rough a surface, the force of 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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3 Static Friction vs. Kinetic Friction
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4
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5
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6 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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7 Example 5-4 Pulling against friction. A 10.0-kg box is pulled along a horizontal surface by a force F P of 40.0 N that is applied at a 30.0 o angle. We assume a coefficient of kinetic friction of 0.30. Calculate the acceleration.
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8 Example 5-8 A plane, a pulley, and two boxes. A box of mass
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This note was uploaded on 04/23/2011 for the course JAPAN 7b taught by Professor Wallace during the Spring '11 term at Berkeley.

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5 More Newtons Laws-1 - Chapter 5 Further Applications of...

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