Physics Ch 11/12 Practice

Which of the following is a true statement regarding springs?

• The higher the value of the spring constant, the stiffer the spring.  
• In Hooke's law, the force exerted by the spring acts in the same direction as displacement.  
• Springs are designed to provide unpredictable variations in force.  
• The force exerted by a spring has a quadratic relationship with the displacement form equilibrium.  

A mass of 43.9kg hangs from a spring. How far will the spring stretch if its spring constant is 700 N/m?

• 43.9

• 0.307 m

• 1.63 m

• 0.614 m

When does the mass move at maximum velocity in a mass-spring system?

• At equilibrium

• At the farthest point from the equilibrium

• At its hightest point

• At its lowest point

What are the two requirements for a simple harmonic oscillator?

• The object vibrates about the equilibrium point and the restoring force is proportional to the displacement

• The object moves left to right and the restoring force is proportional to the displacement

• The object vibrates about the equilibrium and the restoring force is greater than the displacement

• The object moves left to right and the restoring force is greater than the displacement

When is a pendulum in SHM momentarily at velocity of zero?

• At its lowest point

• At its highest point

• It moves at a constant velocity

• It is at rest

A pair of trapeze performers at the circus is swinging from 16 m ropes attached to a large elevated platform. Determine the period for one complete back and forth cycle.

• 2 sec
• 12 sec
• 8 sec
• 10 sec

If the length of a simple pendulum is doubled, its period will: 

• halve 
• increase by a factor of sqrt(2) 
• decrease by a factor of sqrt(2)
• double 

From the graph ,the spring constant is about.

• 4.5 m

• 15 N

• 20 N/m

• 200 N/m

The period of a pendulum may be decreased by

• Increasing the mass of the bob
• moving the equilibrium point
• decreasing the mass of the bob
• shortening the length of pendulum

An object of known mass is attached to a spring and undergoes harmonic motion with period 𝑇 . The experiment is then repeated with 4 times the mass. What’s the new period of oscillation?

• 2T

• T

• 4T

• T√2