Topic 1- Energy

Question 1

Closed System

Answer 1

system that experiences NO NET CHANGE in its TOTAL ENERGY when ENERGY TRANSFERS OCCUR within it

Question 2

Conservation of Energy

Answer 2

The law that energy can be:
- transferred
- stored
- dissipated
BUT never
- created
-destroyed

Question 3

Efficiency

Answer 3

USEFUL ENERGY OUTPUT over TOTAL ENERGY INPUT

Question 4

Elastic Potential Energy

Answer 4

-store of energy for stretched/compressed objects
- DIRECTLY PROPORTIONAL TO MASS OF OBJECT
- DIRECTLY PROPORTIONAL TO EXTENSION squared /COMPRESSION squared

Question 5

Fossil Fuel Examples

Answer 5

coal, oil + gas

Question 6

Gravitational Pot. Energy

Answer 6

• store of energy in all raised objects
• DIRECTLY PROPORTIONAL TO:
  -MASS
  -DISTANCE RISEN
  -GRAVITATIONAL FIELD STRENGTH AT THAT POINT

Question 7

Joule

Answer 7

unit for energy

Question 8

Kinetic Energy

Answer 8

-store of energy in all moving objects
-DIRECTLY PROPORTIONAL TO
-MASS
-VELOCITY SQUARED

Question 9

Power

Answer 9

RATE of ENERGY TRANSFER/RATE OF WHICH WORK IS DONE

Question 10

Renewable Energy Resource

Answer 10

resource that can be REPLENISHED whilst its being USED ( it is INFINITE )

Question 11

Specific Heat Capacity

Answer 11

amount of energy req. to raise the temp of 1KG of a substance by 1 degree

Question 12

System

Answer 12

single/group of OBJECTS

Question 13

Thermal Conductivity

Answer 13

measure of how well a material conducts energy when it is heated

Question 14

Waste Energy

Answer 14

energy that is not usefully used for purpose of system

Question 15

Watt

Answer 15

unit of power

Question 16

Work Done

Answer 16

energy transfer when FORCE acts over a DISTANCE