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The magnitude of kinetic friction fk f k is given by. fk = μkN, f k = μ k N, where μk μ k is the coefficient of kinetic friction. As seen in Table 2.8.1 2.8. 1, the coefficients of kinetic friction are less than their static counterparts. That values of μ μ in Table 2.8.1 2.8. 1 are stated to only one or, at most, two digits is an ...
We can use this fact to measure the coefficient of kinetic friction between two objects. As shown in Example 5.4.1 5.4. 1, the kinetic friction on a slope is f k = μk μ k mg cos θ θ. The component of the weight down the slope is equal to mg sin θ θ (see the free-body diagram in Figure 5.4.1 5.4. 1 ).
This resistance is a force of friction. Friction opposes relative motion between systems in contact but also allows us to move, a concept that becomes obvious if you try to walk on ice. Friction is a common yet complex force, and its behavior still not completely understood. Still, it is possible to understand the circumstances in which it behaves.
We can use this fact to measure the coefficient of kinetic friction between two objects. As shown in Example 6.5.1 6.5. 1, the kinetic friction on a slope is f k = μk μ k mg cos θ θ. The component of the weight down the slope is equal to mg sin θ θ (see the free-body diagram in Figure 6.5.1 6.5. 1 ).
Much of the friction is actually due to attractive forces between molecules making up the two objects, so that even perfectly smooth surfaces are not friction-free. Such adhesive forces also depend on the substances the surfaces are made of, explaining, for example, why rubber-soled shoes slip less than those with leather soles.
Friction - PhET Interactive Simulations
#friction Hey kids!In today's video, we will be learning about Friction.Did you know that when you rub your hands together vigorously, you can feel them gett...
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