Physics P1 Energy Stores And Transfers

Question 1

Name the 8 energy 🔋 stores

Answer 1

Kinetic
Gravitational potential
Elastic potential
Thermal
Chemical
Nuclear
Magnetic 🧲
Electrostatic

Question 2

Name the four ways in which energy can be transferred

Answer 2

Heating
waves
Electric current
Mechanically ( by using forces)

Question 3

What is a system?

Answer 3

An object or a group of objects

Question 4

What is a closed system?

Answer 4

A system where no energy 🔋 can be transferred to or from the surroundings - the total energy in the system stays the same

Question 5

What is work done?

Answer 5

Energy transferred when a force moves an object

Question 6

What is the unit for energy?

Answer 6

Joule (j)

Question 7

What is one joule of work? 💼

Answer 7

The work done when a force of 1N causes an object to move 1m in the direction of the force

Question 8

Describe the energy transfer when a moving car slows down

Answer 8

Energy is transferred mechanically from the kinetic store of the car 🚘 to the thermal store of its brakes - some energy is dissipated to the thermal store of the surroundings

Question 9

Describe the energy transfer when an electric kettle is used to heat water

Answer 9

The electric current in a kettle transfers energy 🔋 to the heating element’s thermal store- energy is then transferred by heating from the heating element’s thermal store to the thermal store of the water

Question 10

Describe the energy when a ball 🏀 is fired 🔥 using an elastic band

Answer 10

Energy is transferred mechanically from the elastic store of the elastic band to the kinetic store of the band - some energy is dissipated to the thermal store of the surroundings

Question 11

Describe the energy transfer when a falling apple 🍎 🍏 hits the ground

Answer 11

Energy is transferred from the kinetic store of the apple 🍏 and dissipated to the thermal store of the surroundings by sound waves 🌊

Question 12

Name the unit that represents one joule transferred per second

Answer 12

Watt (W)

Question 13

What does a material’s thermal conductivity tell u?

Answer 13

How well it conducts heat

Question 14

Which materials have low thermal conductivity?

Answer 14

Thermal insulators

Question 15

Give three factors that determine the rate of thermal energy transfer through a material

Answer 15

Thermal conductivity of material
Temperature difference
Thickness of material

Question 16

What factors affect the rate of heat loss from a building ⁉️

Answer 16

Thickness of walls and roof
Thermal conductivity of walls and roof
The temperature difference between the two sides of the wall/ roof