http://www.ck12.org Chapter 5. Motion in Two Dimensions
Review
Questions
- In simple harmonic motion, when the speed of the object is maximum, the acceleration is zero.
(a) True
(b) False - In SHM, maximum displacement of the mass means maximum acceleration.
(a) True
(b) False - If a spring has a spring constant of 1.00× 103 N/m, what is the restoring force when the mass has been
displaced 20.0 cm?
- simple harmonic motion:A type of periodic motion where the restoring force is directly proportional to the
displacement. - restoring force:A force that tends to restore a system to equilibrium after displacement.
- spring constant:A characteristic of a spring which is defined as the ratio of the force affecting the spring to
the displacement caused by it. - amplitude:The maximum displacement from equilibrium that occurs in an oscillation.
- cycle:A complete revolution in any repeating motion.
- period:The time required for one complete cycle in any repeating motion.
- frequency:The number of complete cycles of any repeating motion that occurs in exactly one second.
Using kinematic equations and the understanding that vertical acceleration does not affect horizontal velocity, it
is easy to calculate the height from which an object is launched or the location at which it will land. These
equations can also be used to understand how satellites maintain a consistent orbit; circular motion and centripetal
acceleration equations can also serve this purpose. Perhaps most interestingly, everything that undergoes periodic
motion—including springs, pendulums, rotating disks, and orbiting satellites—can be understood using the simple
harmonic motion equations.