According to newton's second law of motion, how much force will be required to accelerate an object at the same rate if its mass is reduced by half? a. no change in the amount of force is needed. b. four times the amount of force is needed. c. twice the amount of force will be required. d. half the amount of force will be required.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost