Chapter 2 Work and Energy
- Determine the amount of work done when an object is displaced at an angle of 30o with respect to the direction of t Answer: W = Fscos 30^° = sqrt3/2Fs ≈ 0.866 Fs When a force F acts at an angle θ to the displacement s , only the component of the force alon... 1
- Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation Answer: At height h the object has potential energy mgh and zero kinetic energy; on reaching the ground its kinetic energy is also mgh, so a... 1
- Derive the formula for the kinetic energy of an object of mass m, moving with velocity v. Kinetic energy is the energy possessed by an object by virtue of its motion. K.E=1/2 mV² Derivation: Let us consider an object of m which is... 1
- Explain the difference between potential energy and kinetic energy. Kinetic Energy Potential Energy (i) Kinetic energy is the energy possessed by the body due to its motion. (i) Potential energy is the energy... 1