Topic 3 - Conservation Of Energy Flashcards Preview

GCSE PHYSICS > Topic 3 - Conservation Of Energy > Flashcards

Flashcards in Topic 3 - Conservation Of Energy Deck (19):
1

What's the equation for gravitational potential energy

Mass X gravitational field strength X change in verticle hieght

2

What's the equation for kinetic energy

Half X mass X speed^2

3

What diagrams are used to show energy transfer

Sanky diagrams

4

State the meaning of conservation of energy

A principle that the total energy of an isolated system remains constant regardless of changes within that system

5

Name the eight types of energy

Kinetic, chemical, thermal, gravitational potential, elastic, nucleur and magnetic

6

Name the 4 ways energy can be transferred

Mechanical, heating, radiation and electrical

7

State the meaning of useful energy

Energy that was transferred to its intended store

8

State the meaning of wasted energy

Energy that was transferred to other stores

9

State the meaning of dissipated energy

Energy that has spread out into its surroundings

10

Name the 2 ways you can reduce energy loss

Insulation and lubrication

11

Name the 4 ways you can reduce heat loss in houses

Double glazed windows, cavity packed with thermal insulators, loft full of insulators and thick walls

12

How is heat lost from homes

Conduction and convection

13

What is the equation for efficiency

Useful energy oytput ÷ total energy input

14

Name the 3 main fossil fuels

Oil, gas and coal

15

Name 2 disadvantages of fossil fuels

Release CO2 and sulfur dioxide

16

State the meaning of renewable energy

Energy that is being replenished as it's used

17

Name 2 advantages of renewable fuels

Release no CO2
Never run out

18

Name 4 disadvantages of renewable fuels

Floods
Unreliable
Increase food price
All produce electricity

19

When do mechanical processes become wasteful

When they cause a temperature rise and heat the surroundings