Waves 12-1: Simple harmonic motion
Give three examples of periodic motion


What is the equilibrium position of an oscillating object?

Why is the velocity greatest at the equilibrium position?

why not before it?

why not beyond it?

What is damping (and what causes it)?

What is the restoring force?  What is it proportional to?

What is simple harmonic motion?

What is Hooke’s law? (Give the full names of the terms.)

What unit(s) is a spring constant given in?

Give five examples of springs.  Rank them in increasing order of their spring constants.


How much force can a slingshot produce on a rock if it is pulled back 0.23 m and it has a spring constant of 150 N/m on each of the two rubber bands?

What is the spring constant of a spring that stretches 0.17 m when a load of 57 N is placed on it?

When does a spring have the greatest elastic potential energy?

Why is Earth’s rotation periodic but not simple harmonic?

Give four examples of pendulums (or things exhibiting motion like a pendulum).

What is a bob?

What three things do we disregard when talking about a pendulum?

Why is the motion of a pendulum simple harmonic only at small angles?

For a pendulum in motion:
Where is the force greatest?
Where is the acceleration greatest?
Where is the velocity greatest?

Use figure 12-7 (p.444) to mathematically explain the relationship between Mechanical Energy, Kinetic Energy, and Potential Energy in a pendulum.  (In other words, write an equation that sums it all up.)

Why does an acrobat swing past the equilibrium position when there is no force acting on her at that point?

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