What does it mean when "energy is conserved"?

• Energy is created and destroyed.

• Energy changes form but is not lost.

• Energy is only used in closed systems.

• Energy is always increasing.

What is a "system" in the context of energy?

• A group of interacting or interrelated entities.

• A single object with no interactions.

• A closed loop with no energy transfer.

• A random collection of objects.

Which of the following is an example of "work done by a force"?

• A book resting on a table.

• A car accelerating on a highway.

• A light bulb glowing.

• A fan spinning without moving air.

What is the unit for energy?

• Newton

• Joule

• Watt

• Pascal

What does "power" refer to in physics?

• The rate of doing work.

• The amount of energy stored.

• The force applied over a distance.

• The speed of an object.

What is a "closed system"?

• A system where energy can enter but not leave.

• A system where neither energy nor matter can enter or leave.

• A system where only matter can enter or leave.

• A system where energy is constantly created.

What does "lubrication" do in a machine?

• Increases friction between moving parts.

• Decreases friction between moving parts.

• Stops all movement in the machine.

• Increases the energy consumption.

What is thermal conduction?

• The transfer of heat through a material

• The conversion of heat into electricity

• The storage of heat in a material

• The reflection of heat from a surface

What does it mean if a material has a low thermal conductivity?

• It transfers heat quickly

• It transfers heat slowly

• It reflects heat

• It absorbs heat

What is an energy resource?

• A source of energy that can be replenished

• A material that stores energy

• A device that uses energy

• A method of conserving energy