EVERYDAY SCIENCE

Detailed explanation-1: -A ball rolling down a hill has both Kinetic and potential energy. Kinetic energy is due to motion. So if the ball is rolling down it has kinetic energy. Potential energy is the stored energy which is waiting to be used.

Detailed explanation-2: -A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy (Kt) as well as rotational kinetic energy (Kr) simultaneously.

Detailed explanation-3: -Kinetic Energy of Rolling Object If an object is rolling without slipping, then its kinetic energy can be expressed as the sum of the translational kinetic energy of its center of mass plus the rotational kinetic energy about the center of mass.

Detailed explanation-4: -Kinetic energy is greatest immediately after you stop doing work to get the ball rolling. Maximum gravitational potential energy could occur at either the top of the first hill, or at the ball’s highest point on the second hill, depending on circumstances.

Detailed explanation-5: -3.6 & 3.7 The Law of Conservation of Energy. As the car coasts down the hill, it moves faster and so it’s kinetic energy increases and it’s potential energy decreases. On the way back up the hill, the car converts kinetic energy to potential energy.