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**Unformatted text preview: **rei Sirenko, NJIT 15 Lecture 9 Andrei Sirenko, NJIT 16 Sample Problem 7-8 Work Done by a General
Variable Force A block of mass m = 0.40 kg slides across a horizontal
0.40
frictionless
frictionless counter with a speed of v = 0.50 m/s. It runs
0.50
into and compresses a spring of spring constant
k = 750 N/m. When the block is momentarily stopped by
750 N/ Wh th bl
the spring, by what distance d is the spring compressed? Work: variable force
variable force Calculus
Divide area under curve
Add increments of W (numerically)
Analytical form?
Integration!!! Lecture 9 Andrei Sirenko, NJIT 17...

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