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tica86

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We were going over this in class today but I don't understand it, why is Newton's first law not violated?

What applied force would you need to keep the block moving with a constant velocity that is twice as large as before?

I also have the following questions that I just want to make sure I'm doing correctly:

What is the magnitude of the unknown force?

a. A 1.0 N weight is hanging at rest from a chain with weight of 0.5N. Is magnitude=1.0+0.5N?

b.A 1.0 N weight is hanging at rest from a string with negligible weight. Magnitude =1.0+0?

c.A spring with negligible weight and a hanging weight of 1.0 N. Magnitude=1.0+0??