EVERYDAY SCIENCE

Detailed explanation-1: -Friction causes some mechanical energy to change to ‘thermal’ energy. Energy that is stored is ‘kinetic’ energy. ‘Mass’ is measured in joules. Doubling an object’s velocity will ‘double’ its kinetic energy.

Detailed explanation-2: -Friction is an everyday force that is created by two surfaces interacting. When these surfaces slide against each other, this interaction increases the thermal energy of the two surfaces (the temperature goes up).

Detailed explanation-3: -Friction, like air resistance, are forces that take energy away from the system as the system progresses. This means that the energy is lost due to friction and can’t be regained. Hence, friction doesn’t increase the mechanical energy of a body, albeit it decreases.

Detailed explanation-4: -Thermal energy is due to the two surfaces (i.e Walter’s fur and the ice) rubbing against each other, which is basically friction. So the work done by friction is W-Fk*d (Fk is the force of friction) and it is equal to the thermal energy.

Detailed explanation-5: -Whenever a moving object experiences friction, some of its kinetic energy is transformed into thermal energy. So, the mechanical energy of the spinning top is transformed to thermal energy.