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# N3 - Concept Test In the 17th century Otto von Güricke a...

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N3: Forces from Motion

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A book sits at rest on a table. What explains the absence of a net force on the book? Concept Test 1. Newton’s third law implies that the normal force equals the gravitational force. 2. Force is caused by acceleration, so the absence of acceleration implies there is no force. 3. The normal force has adjusted itself to exactly cancel the gravitational force. 4. None of the above is a correct explanation.
Problem : Two blocks of mass m1 and m2 are stacked on top of each other on a horizontal surface. The lower block is pushed by a constant horizontal force acting on the lower block. The coefficient of static friction between the two blocks is μ. What is the maximum horizontal force such that the top block does not slide relative to the lower block?

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Concept Test

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Unformatted text preview: Concept Test In the 17th century, Otto von Güricke, a scientist in Magdeburg Germany, ftted two hollow bronze hemispheres together and removed the air From the resulting sphere with a pump. Two eight-horse teams could not pull the halves apart even though the hemispheres Fell apart when air was readmitted. Suppose von Güricke had tied both teams oF horses to one side and bolted the other side to a heavy tree trunk. In this case, the tension on the hemispheres would be 1. twice 2. exactly the same as 3. halF what it was beFore. Problem : A 0.15 kg ball is tied to the end of a string of length 0.5 m that is held by an astronaut in zero gravity. The ball spins in a circle at a uniform rate of 1 revolution per second. What is the tension in the string?...
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N3 - Concept Test In the 17th century Otto von Güricke a...

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