Exam 5

What is periodic motion?

• Motion that follows a straight line.
• Motion that changes direction randomly.
• Motion that speeds up continuously.
• Motion that repeats at regular intervals.

Give examples of periodic motion.

• a child swinging in a swing
  earth around the sun
  earth spinning around itself
  hands of a clock
  heartbeat
  tuning fork

• Free-falling objects

  thrown balls

  Waves caused by seismic events

  Walking

What type of motion is simple harmonic motion?

• Uniform motion
• Circular motion
• Random motion
• circular motion viewed edge-on

When does simple harmotic motion occur

• When the displacement is zero
• When the velocity is constant
• When the acceleration is zero
• when the net force along the direction of motion obeys Hooke’s law

Understand Hook’s law.

• Hook's law only applies to liquids, not solids.
• The force needed to extend or compress a spring is constant regardless of the distance the spring is stretched or compressed.
• The force needed to extend or compress a spring is inversely proportional to the distance the spring is stretched or compressed.
• The force needed to extend or compress a spring is directly proportional to the distance the spring is stretched or compressed.

What is a restoring force?

• A restoring force is a force that keeps an object in motion
• A restoring force is a force that acts to bring an object back to its equilibrium position after it has been displaced.
• A restoring force is a force that causes an object to accelerate
• A restoring force is a force that changes the direction of an object's motion

What does the minus sign in Hook’s law indicate.

• Friction
• Tension
• Restoring force
• Opposing force

How do we define amplitude, period and frequency in simple harmonic motion?

• Amplitude is the maximum displacement from the equilibrium position, period is the time taken to complete one full cycle, and frequency is the number of cycles completed in one second.
• Frequency is the speed of the oscillation
• Period is the time taken to complete half a cycle
• Amplitude is the minimum displacement from the equilibrium position

Maximum acceleration in simple harmonic motion.

• a = -ω * x
• a = -ω^2 * x
• a = ω^2 * x
• a = -x

What is elastic potential energy?

• Elastic potential energy is the energy stored in an object when it is at rest.
• Elastic potential energy is the energy stored in an object when it is heated.
• Elastic potential energy is the energy stored in an object when it is stretched or compressed.
• Elastic potential energy is the energy stored in an object when it is in motion.