GRADE 9 - HEAT, WORK AND ELECTRICITY

It is an energy that is transferred from one object to another object due to difference in temperature between two objects.

Heat flows from _______ substances because warmer molecules move faster.

It is the energy transferred when an object is move against force.

A branch of physics that deals with the physical laws that relate heat and mechanical work.

Energy cannot be created nor destroyed. It can only be transformed from form to another. What law is this?

The sum of the molecular kinetic energy (due to the random motion of the molecules) and the molecular potential energy.

What is the last process in order to provide electrical energy?

GENERATION - TRANSMISSION - ______________

If you remove heat to the system, what will happen to its internal energy?

When an object is heated, its average kinetic energy of molecules known as ___________ increases.

What does the triangle (∆) in this equation: ∆U stands for?