The mass is just sitting there motionless. There is no acceleration and it is in equilibrium. What does this mean? This means that the net force in the y-direction (vertical direction) must be zero. I ...

Springs are a common device for storing energy. A spring which is compressed from its by an amount x from its equlibrium length exerts a force This work represents energy transferred to the spring and ...

A force of 3 N is applied to a spring. The spring stretches reversibly by 0.15 m - the fact that the string stretches reversibly means that it will go back to its normal shape after the force has been ...