 # Work Energy and power Work Energy and power

• Slides: 46 Work , Energy and power Work , Energy and power Scalar product   Work done by variable force Numerical Kinetic Energy Work-Energy Theorem Potential Energy Conservative and Non-conservative force Conservation of Mechanical Energy Potential Energy of a Spring Potential Energy of a Spring Potential Energy of a Spring Numerical Various Forms of Energy Various Forms of Energy Various Forms of Energy Various Forms of Energy Mass –Energy Relation Power Power Collisions Collision in one dimension Collision in one dimension Collisions in one dimensions Collisions in one dimension Completely inelastic collision Numerical Collisions in two dimensions Collisions in two dimensions Collisions in two dimensions • Example: Two balls initially travelling along the xaxis with opposite velocities collide with each other obliquely, is it possible that they will move in the y-axis after collision? • Solution: Yes, it is possible, if the balls have same mass and travel with same speed. Initially their total momentum in x-direction was zero as their velocities were opposite; also in y-direction it is zero because they do not have velocity in that direction. Now after collision if their velocities are still equal and in opposite direction, the total momentum still remains zero. ASSIGNMENTS ASSIGNMENTS ASSIGNMENTS ASSIGNMENTS ASSIGNMENTS NUMERICAL PROBLEMS Numerical problems Numerical problems Numerical problems Numerical problems Assignments 