Q. 1: The Earth pulls down on you with a gravitational force that wecall your we
ID: 1723534 • Letter: Q
Question
Q. 1:
The Earth pulls down on you with a gravitational force that wecall your weight. Do you pull up on the Earth with the same amountof force?
Q 2:
Describe a few examples in which the force of friction exertedon an object is in the direction of motion of the object
Q 3:
Consider a lamp hanging from a chain. What is the tension in thechain?
Q 4:
Does a speeding missile possess force?
Q 5:
Why does a book sitting on a table never accelerate"spontaneously" in response to the trillions of inter-atomic forcesacting withinit?
Q 6:
Suppose we measure time by using hour glasses filled with sand.Discuss the various errors that would exist if we tried to use thisas a world standard for time. Give a rough estimate for the errorover a 24 hourperiod.
Explanation / Answer
Q 2: Describe a few examples in which the force of frictionexerted on an object is in the direction of motion of theobject.
Solution: Every one of these inter-atomicforces is part of an action-reaction pair within the book. Theseforces add up to zero, no matter how many of them there are, thisis what makes Newton's first law apply to the book. The book haszero acceleration unless an external force acts on it.
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