Exam 7 Review

A stiff material has a:

• high spring constant
• low spring constant
• spring constant of any value
• spring constant which is difficult to predict

If a force of 20 N stretches a spring 0.5 m, what is the spring constant?

• 10 N/m
• 20 N/m
• 40 N/cm
• 40 N/m

A mass attached to a spring vibrates back and forth. At the equilibrium position, the

• acceleration reaches a maximum.
• velocity reaches a maximum.
• net force reaches a maximum.
• velocity reaches zero.

Which of the following is necessary to make an object oscillate?

• a stable equilibrium

• little or no friction

• a disturbance

• All of these

Which of the following is true for a system consisting of a mass oscillating on the end of an ideal spring?

• The kinetic and potential energies are equal to each other at all times.

• The maximum potential energy is achieved when the mass passes through its equilibrium position.

• The maximum kinetic energy and maximum potential energy are equal, but occur at different times.

• The maximum kinetic energy occurs at maximum displacement of the mass from its equilibrium position

A block oscillates without friction on the end of a spring as

shown. The minimum and maximum lengths of the spring as it oscillates are,respectively, x_min and x_max. Which graph can represent the total mechanical energy of the block-spring system as a function of x?

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An object hangs motionless from a spring. When the object is pulled down, the sum of the elastic potential energy of the spring and the gravitational potential energy of the object

and Earth

• 1. increases because the object will accelerate past the original equilibrium point

• 2. stays the same because the sum of the U spring and U grav is equal to zero

• 3. decreases because of gravity

Above is the angular velocity of a spring oscillator in terms of frequency (f), period (T), spring constant (k) and mass (m). Which of the following formulas give you the period of a spring oscillator?

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Which of the following affect the period of a spring oscillator?

• spring constant

• Amplitude

• mass attached

• gravitational acceleration

A 25,000 N Car is supported by 4 springs.  If each spring is deflected by 0.040 m what is the spring constant? 

• 160,000 N /m
• 620,000 N/m
• 630,000 N/m
• 120,000 N/m

Tags

NGSS.HS-PS2-1