Heat energy spontaneously migrates from areas of higher temperature to areas of lower temperature.

Match each method of heat transfer with its description.

A. Conduction: Heat flows from warmer to cooler by contact between the materials.

The hot coffee heats the mug which heats my hands which are holding the mug.

B. Convection: Heat flows from one place to another because the heated material

itself moves. The warm winds blow and heat from the tropics ends up in

Pennsylvania.

C. Radiation: An object loses heat to the environment via electromagnetic waves.

The wavelength of these waves is determined by the temperature of the object,

with cooler objects giving off longer wavelengths.

A ball of mass 2 kg is placed at a height of 50 m from the ground. If the ball starts rolling down the

inclined plane, what are the potential and kinetic energies at positions A, B, C and D assuming that the

ball does not experience any frictional force?

Potential @ A 980 Kinetic @ A 0

Potential @ B 490 Kinetic @ B 490

Potential @ C 490 Kinetic @ C 490