Energy Topic

Question 1

Chemical Energy

Answer 1

Energy stored in food, fuels or batteries - released through chemical reactions

Question 2

Kinetic Energy

Answer 2

Energy stored in a moving object

Question 3

Gravitational Potential Energy

Answer 3

Energy stored in a object lifted against gravity

Question 4

Thermal Energy

Answer 4

Energy stored in hot or warm objects - the hotter the object, the more energy it has stored

Question 5

Elastic (Strain) Energy

Answer 5

Energy stored in a squashed or stretched object

Question 6

Electrostatic Energy

Answer 6

Anything with electric charge that is attracting or repelling another electric charge

Question 7

Nuclear Energy

Answer 7

Atomic Nuclei have energy in the store can be released in nuclear reactions

Question 8

Magnetic Energy

Answer 8

Anything magnetic that is interacting with another magnet

Question 9

What is a System

Answer 9

A single object or a group of objects

Question 10

What is a Closed System

Answer 10

A system where neither matter not energy can leave or enter

Question 11

How can energy be transferred between stores

Answer 11

• Electrically
• Mechanically (lifting, pushing, pulling)
• By Heating
• By Light or Sound
• By Radiation

Question 12

Equation for Kinetic Energy

Answer 12

Kinetic Energy (J) = 0.5mass(Kg)(speed)2(m/s)

Question 13

Equation for Elastic Potential Energy

Answer 13

Elastic Potential Energy (J) = 0.5 * Spring Constant (N/M) * (Extension)2 (m)

Question 14

What is Extension

Answer 14

when an object increases in length

Question 15

What is Compression

Answer 15

when an object decreases in length or is squashed

Question 16

Equation for Extension

Answer 16

Force (N) = Spring Constant (N/M) * Extension (m)

Question 17

What is the Spring Constant?

Answer 17

Measure of the stiffness of a spring up to its Limit of Proportionality or Elastic Limit
The higher the Spring Constant, the stiffer the spring

Question 18

What is the Limit of Proportionality?

Answer 18

Refers to the point beyond which an object cannot return to its original state - Hooke’s Law no longer applies

Question 19

Specific Heat Capacity

Answer 19

The energy required to raise the temperature of 1Kg of a substance by 1C
C(J/KgC)

Question 20

Specific Heat Capacity Equation

Answer 20

C = Energy (J) / Mass * Temperature Change

Question 21

Design a method for an experiment with an aim to measure specific heat capacity of a metal

Answer 21

1. Place the immersion heater into the slot at the top of the metal block
2. Put the thermometer into the smaller slot
3. Insulate the block by wrapping it with wool
4. Record the stating temperature of the block
5. Connect the heater to the power supply and turn it off after ten minutes
6. Record the ending temperature then calculate the temperature change
7. Repeat with different layers and different types of insulation

Question 22

Energy Transfer Equation

Answer 22

Energy Transfer = Potential Difference * Current * Time
E = VIt

Question 23

Work Done Equation

Answer 23

Work Done = Force * Distance

Question 24

Work Done Equation when lifting

Answer 24

Work Done = Weight * Height

Question 25

What is Power?

Answer 25

Power is the rate of work being done or rate of energy transferred

Question 26

Power Equation

Answer 26

Power = Work Done / Time Taken
or
Power = Energy Transferred / Time

Question 27

Gravitational Potential Energy Equation

Answer 27

Gravitational Potential Energy = Mass * Gravitational Field Strength * Change in Height