Consider the situation where you are pulling a block with a string, where the bl

Question

Consider the situation where you are pulling a block with a string, where the block is moving on a surface with friction. If the block is moving with a constant velocity of 1.0 m/s, what can you say about the required applied force (provided by the string) needed to move the block at 2.0 m/s? (Choose the best answer) A.) The applied force will be larger, but we do not know how much larger without knowing the friction force B.) There will be twice as much work done against friction, so the applied force needs to be doubled C.) The kinetic friction is independent of velocity, so the applied force can be the same, after we are done accelerating the block D.) The force will depend on the size of the friction at the new velocity, so it must measured at the new speed

Explanation / Answer

the kinetic friction only depends on mass and the coefficient of friction.it is independent of velocity.So to accelerate the object to 2m/s we will have to increase the applied force so that it is greater than frictional force for a certain period and after that we can remove that excess force. so the option is C

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