Simple Harmonic Motion

What does "k" represent in the formula for potential energy $U = \frac{1}{2}kx^2$ used for springs?

In which situation would you expect no net work done on or by the system within one complete cycle?

If two objects collide in an isolated system and stick together after the collision, which of the following must remain constant before and after the collision?

For an ideal spring-mass system oscillating with simple harmonic motion, what happens to the total mechanical energy if the amplitude of oscillation is doubled?

If the amplitude of a simple harmonic oscillator is quadrupled, its total mechanical energy will _____

A block with a mass of 10 kg connected to a spring oscillates back and forth with an amplitude of 2 m. What is the approximate period of the block if it has a speed of 4 m/s when it passes through its equilibrium point?

In simple harmonic motion, which equation correctly describes the kinetic energy (K) of an oscillator at its maximum displacement?

Which factor does not affect the period (T) of a pendulum undergoing simple harmonic motion?

What happens to the total mechanical energy of a simple harmonic oscillator if the amplitude of oscillation is doubled while keeping mass and spring constant unchanged?

What happens to the total mechanical energy of an ideal spring-mass system oscillating with no external forces?