energy transfers , heat transfers

Question 1

what are the 4 energy transfers?

Answer 1

mechanical, electrical, heat, radiation

Question 2

gravitational potential energy

Answer 2

Object above the ground

Question 3

Kinetic energy

Answer 3

in moving objects

Question 4

magnetic

Answer 4

when 2 magnets attract or repel

Question 5

elastic potential

Answer 5

in anything stretched

Question 6

chemical

Answer 6

anything with energy that can be released by chemical reaction

Question 7

thermal

Answer 7

everything has something from this store, hotter = more energy

Question 8

electrostatic

Answer 8

when 2 electrical charges attract or repel

Question 9

conservation of energy

Answer 9

energy can’t be created or destroyed only transferred

Question 10

what are the units of energy?

Answer 10

Joules

Question 11

equation for kintetic energy (with units)

Answer 11

0.5 x mass x velocity²

J= 0.5 x kg x m/s

Question 12

equation for GPE

Answer 12

GPE = mass x gravitational field strength x height

J= kg x N/kg x m

Question 13

what happens to hot and cool air ? (related to density)

Answer 13

hot air rises, cool air sinks

Question 14

conductor

Answer 14

transfers energy easily (metals)

Question 15

insulator

Answer 15

doesn’t transfer energy easily (plastic)

Question 16

conduction

Answer 16

when heated particles gain kinetic energy, particles vibrate and pass internal energy to nearby particles causing them to vibrate more

Question 17

convection

Answer 17

happens in liquid + gases, takes place of particles with less thermal energy

Question 18

radiation

Answer 18

no particles involved, can happen when objects aren’t touching
all objects transfer energy to surroundings by infrared radiation