Two packages are connected by a very light string that goes over an ideal pulley as showm in the figure. Package A has a mass of 2 kg and can slide along a rough plane inclined at 30° above the horizontal. The string acts on package A parallel to the surface of the plane. The coefficient of static friction between package A and the plane is 0.4. What minimum mass should package B have in order to start package A sliding up the ramp? Please write your numerical answer: (Please provide your numerical answer without unit! Please write your numerical answer with all digits and do not use scientific notation. If you are not sure about the number of significant figures, you can keep the number of figures as many as possible- You will not be punished for doing this. No unit in your answer.) kg 30°

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.