Flashcards in P1-Energy Stores and Systems Deck (21):

1

## Name all the energy stores

###
Thermal

Kinetic

Gravitational Potential

Elastic Potential

Chemical

Magnetic

Electrostatic

Nuclear

2

## How is energy transferred?

###
Mechanically by doing work

Electrically work done by moving charges

Heating

Radiation

Between energy stores

3

## What is a system?

### A single or group of objects that you are interested in

4

## What happens when a system changes?

### Energy is transferred into or away from he system, between two objects or between types of energy store

5

##
What is a closed system?

### A system where neither matter nor energy can enter or leave

6

## What is the net change in a closed system?

### The net change in the total energy of a closed system is always 0

7

## Describe the energy transfer of boiling a kettle

### Energy is transferred to the water (from kettle heating element) by heating electrically into the waters thermal energy store

8

## What is work done?

### Work done is another way saying energy transferred. It can be done when current flows or by force moving an object

9

## What happens when you throw a ball upward

### Initial force is exerted by a person and causes work to be done, energy is transferred from the chemical store in a persons arm to the kinetic energy of the ball and arm

10

## What happens when a ball is dropped

###
The gravity does the work

Causes energy to be transferred from the balls gravitational energy store to its kinetic energy store

11

## What happens when a car brakes

###
Friction between the wheels and the brakes does work as it slows down

It causes energy transfer from the wheels’ kinetic energy stores to the thermal energy store of the surroundings

12

##
Which store does eventually all energy end up in?

### Thermal Store

13

## What way can energy use to be transferred

### Sound waves

14

## If anything is moving what energy store is the energy in?

###
Kinetic

15

## What is the equation for working out kinetic energy

###
Kinetic Energy (joules)=

1/2 x mass (kg) x speed (m/s) squared

16

## If a car of a mass of 2500KG is travelling at 20 m/s calculate the kinetic energy

###
1/2 x 2500 x 20 x 20

(20 squared)

=500 000 joules

17

##
When you lift an object work is done, where store does the energy worked go into?

### When an object is lifted energy always goes into the gravitational potential energy store

18

## What is the equation for the gravitational potential energy

###
GPE=

Mass x height x gravitational field strength

19

## What happens when an object falls

### Energy from the gravitational potential energy store is transferred to its kinetic energy store if there’s no air resistance. But if there is then some of the energy will also go into the thermal energy store (like in real life)

20

## What store is filled if an object is stretched or squashed

### The elastic potential energy store

21