Energy stores and transfers

Question 1

What is energy?

Answer 1

Energy is the ability to do work.

Question 2

What is kinetic energy?

Answer 2

Kinetic energy is stored in moving objects with mass.

Question 3

What factors affect kinetic energy?

Answer 3

• Mass of an object (requires more energy to reach resting velocity.)
• Speed of an object.

Question 4

How can you calculate kinetic energy?

Answer 4

½mass x velcoity²

Question 5

What is gravitational potential energy?

Answer 5

• Gravitational potential energy is stored in raised objects with mass in a gravitational field.

Question 6

How can you calculate gravitational potential energy?

Answer 6

massx gravitational field strengthx height

Question 7

What is elastic potential energy?

Answer 7

Elastic potential energy is stored in stretched or compressed objects.

Question 8

How do you calculate elastic potential energy?

Answer 8

½×force×extension²

Question 9

What is chemical energy?

Answer 9

Chemical energy is stored between chemical bonds that can release energy by a chemical reaction.

Question 10

What contains chemical energy?

Answer 10

Fuels, Food, Batteries

Question 11

What is thermal energy?

Answer 11

Thermal energy is the total kinetic energy of particles, depending on it’s mass.
The vibrations are faster in hotter objects — more thermal energy.

Question 12

What is internal energy?

Answer 12

Internal energy is the total energy stored in a system from the particles
It is the kinetic energy of the particles along with the potential energy between the bonds combined.

Question 13

What is nuclear energy?

Answer 13

Nuclear energy is stored in the nucleus of an atom.

Question 14

What is electrostatic energy?

Answer 14

Electrostatic energy is stored when a charge interracts with another charge by attracting or repelling it.

Question 15

What is magnetic energy?

Answer 15

Magnetic energy is stored when a magnet interracts with a magnetic material by repelling or attracting it.

Question 16

What does The Law of the Conservation of energy state?

Answer 16

Energy cannot be created or destroyed, only stored and transferred.
Total energy before transfer = total energy after transfer

Question 17

What is mechanical work?

Answer 17

Mechanical work is when a force moves an object through a distance.

Question 18

What is electric work?

Answer 18

Electric work is when charges flow due to a potential difference.

Question 19

What is a potential difference?

Answer 19

Potential difference is a charge difference that allows energy to be transferred between two points in a circuit to make a charge flow.

Question 20

What is heating?

Answer 20

Heating is when energy is transferred from hotter to colder regions (electrically, chemical reaction)

Question 21

What is radiation?

Answer 21

Radiation is when energy is tranferred as a wave. eg. light/ sound/ infrared.

Question 22

What is potential energy?

Answer 22

Potential energy is mechanically stored or due to position.
Stretching out a bow, has a POTENTIAL to be transferred as kinetic once released

Question 23

What is a system?

Answer 23

A system is an object or group of objects.

Question 24

What is vibrational energy?

Answer 24

Vibrational energy is stored in objects that move back and forth.

Question 25

What properties affect the strength of gravitational attraction?

Answer 25

• Mass
• Gravitational field strength
• Distance between 2 objects