5 Steps to a 5 AP Physics C, 2014-2015 Edition by Greg Jacobs

Author:Greg Jacobs
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2013-10-15T00:00:00+00:00

Similarly, the work done by a spring is given by Wspring = ½kx2. Here’s an example problem.

A block with a mass of 2 kg is attached to a spring with k = 1 N/m. The spring is compressed 10 cm from equilibrium and then released. How fast is the block traveling when it passes through the equilibrium point? Neglect friction.

It’s important to recognize that we CANNOT use kinematics to solve this problem! Because the force of a spring changes as it stretches, the block’s acceleration is not constant. When acceleration isn’t constant, try using energy conservation.

We begin by writing our statement for conservation of energy.

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