Study of Rectilinear Motion 
1. When acceleration is _______, velocity of a particle is constant.
2. In a closed loop control system with positive value of feedback gain, the overall gain of the system will ___
3. A simple mass spring damper system having natural frequency ωn. If the spring stiffness is halved and mass is doubled, what will be its natural frequency?
4. A block whose mass is 4kg is fastened with a spring constant k = 64 N/m. The block is pulled from its equilibrium position on a frictionless surface and released. The period of the resulting motion in seconds is ___
5. The natural frequency of a mass spring damper system is ωn. The natural frequency of this system in the moon will be __
6. The time period of a mass spring damper system depends on ____
7. The time period of a mass, suspended from a spring is 'T'. If the spring is cut into 4 equal parts and same mass is suspended from one of the parts, then the new time period will be,
8. When a system is vibrating in a normal mode,
9. A mass of 0.5 kg is suspended in a vertical plane by a spring having a stiffness coefficient of 300 N/m. The mass is displaced vertically downward from its static equilibrium position through a distance of 0.01 m . Find the natural frequency of the system.
10. The natural frequency of a single degree of freedom system decreases when the mass ____
11. For an under damped system, the damping ratio is