energy ch 1

Question 1

Energy

Answer 1

Energy is defined as the ability to do work

Question 2

work

Answer 2

is any action that opposes gravity.

Question 3

Energy can be placed into two categories:

Answer 3

1- Kinetic Energy example : water falling
2-Potential Energy example : at the top lake

Question 4

energy unit is ________and common unit __________

Answer 4

1- joules or j
2-calorie or cal

joolz

joules

Question 5

_________ is associated with the energy of objects in motion.

Answer 5

Heat

Question 6

_________is required to cause phase changes in materials.

Answer 6

Heat is required to cause phase changes in materials.

Question 7

kinetic energy and potential energy :

ki aat ic

kin etic

Answer 7

kinetic energy is the energy of motion or action
potential energy is the energy of position or stored energy

Question 8

the principal form of energy :

Answer 8

light / heat /electrical/mechanical / nuclear / chemical

Question 9

characterstic :

Answer 9

1-energy can not be destroyed or created
2-energy may be converted from on form to another but less than 100% efficiency
3-all chemical reaction involve either gain or loss of energy

Question 10

gasline moves our cars from place to place by energy stored in it and releases as ________

gac line

Answer 10

heat

Question 11

calorie

Answer 11

defined as the amount of heat energy required to increase the temperature of 1g of water 1 c