Energy matters

Question 1

What is meant by the term energy

Answer 1

Energy is the ability to ‘do work or cause a change

Question 2

What is the unit for energy?

Answer 2

Energy is measured in Joule (J).
1000J = 1kJ

Question 3

What is the difference between potential & kinetic energy?

Answer 3

Kinetic energy : energy due to motion
Potential energy : energy that is stored in an object

Question 4

What are the different forms of kinetic energy?

Answer 4

sound, light, electrical, and heat

Question 5

Sound Energy

Answer 5

-A type of Kinetic energy (movement)
-Sound waves are the movement of particles

Question 6

Light Energy

Answer 6

Anything luminous gives off light energy, like the sun, light bulbs ,

Question 7

Electrical Energy

Answer 7

Energy caused by the movement of charges, Easily transported through power lines and converted into other useful forms of energy.

Question 8

Heat Energy

Answer 8

The heat energy of an object determines how active its atoms are.

Question 9

What are the three different forms of potential energy?

Answer 9

Chemical Potential
Nuclear Energy
Elastic Potential Energy
Gravitational Potential Energy

Question 10

Chemical Potential

Answer 10

This is potential energy stored within the chemical bonds of an object.

Question 11

Nuclear Energy

Answer 11

Energy stored in the nucleus of atoms
Released only from nuclear reactions.

Question 12

Elastic Potential Energy

Answer 12

Potential energy (stored energy) due compression or expansion of an elastic object. i.e. a stretched or squashed object.

Question 13

Gravitational Potential Energy

Answer 13

Potential (stored) energy due to an object’s position (up high).

Question 14

What is meant by the term Work?

Answer 14

it is the amount energy used in carrying out the task.

Question 15

What is meant by the conservation of energy law?

Answer 15

Energy cannot be created or destroyed, Whenever energy is converted from one form to another, the total energy remains constant.

Question 16

What is the an energy transfer?

Answer 16

energy is passed along but its type is NOT changed
Example: Kinetic → Kinetic

Question 17

What is the an energy transformation?

Answer 17

energy changes from one type of energy to a different type.
Example: Gravitational → Kinetic

Question 18

An example of an energy transfer?

Answer 18

Heat energy is transferred
from the fire to the cat, when a cat is lying by the fire.

Question 19

An example of an energy transformation?

Answer 19

Potential gravitational energy in a ball is converted to kinetic energy when it falls towards the ground.

Question 20

What is thermodynamics?

Answer 20

Thermodynamics is the study of how heat (thermal energy) can be transferred between objects or transformed into other forms of energy. Thermodynamics obeys the law of conservation and energy - Energy cannot be created or destroyed.

Question 21

What is a closed thermodynamic system?

Answer 21

A closed system can exchange energy (as heat or work) but not matter, with its surroundings.

Question 22

How does thermal equilibrium occur?

Answer 22

Thermal equilibrium occurs when two bodies are in contact with each other and can freely exchange energy.

Question 23

What is an example of objects creating thermal equilibrium?

Answer 23

Imagine a hot cup of tea placed in a cooler room. Over time, the tea will cool down, and the room might become slightly warmer. This exchange of heat will continue until the temperature of the tea matches the room’s temperature. At this point, they have reached thermal equilibrium.

Question 24

How does conduction work as an example of heat transfer?

Answer 24

occurs when two objects at different temperatures are in contact with each other.

Question 25

How does convection work as an example of heat transfer?

Answer 25

is the transfer of heat by the movement of a fluid (liquid or gas) between areas of different temperature.