Suppose that you were to walk into a room in which a book is at rest on a shallo
ID: 1362082 • Letter: S
Question
Suppose that you were to walk into a room in which a book is at rest on a shallow incline, as s own in the diagram below. On the basis of this single observation and our work in this lab, answer e questions in parts a and b below. Which is larger in magnitude: the normal force N exerted on the book by the incline, the weight mg of the book, or are they equal in magnitude? Explain your reasoning in words and with a diagram Is it correct to conclude that the frictional force exerted on the book is necessarily equal to the quantity mu_s N (where mu_s is the coefficient of static friction between the book and the incline)? If so: State so explicitly, and explain your reasoning. If not: Could the frictional force be great than or less than mu_s N? Explain your reasoning.Explanation / Answer
a) the normal force is given by mg *cos(theta)
where theta is the angle of the incline
while the weight is mg
since cos(theta) varies between 0 to 1 so , normal force is smaller than the weight mg .
weight mg is larger in magnitude .
b) Static friction force acts in response to a force trying to cause a stationary object to start moving. If there is no such force acting on an object, the static friction force is zero. If there is a force trying to cause motion, the static friction force will increase up to a maximum value before it is overcome and motion starts.
the static frictional force is given by less or equal to mus * N
the frictional force above it leads to motion in object .
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