energy

Question 1

What’s kinetic energy

Answer 1

kinetic energy is energy stroed in moving objects

Question 2

What’s gravitational potential energy?

Answer 2

Enrgy stored in objects due to its gravity

Question 3

What’s thermal energy

Answer 3

energy stored in hot objects

Question 4

What’s elastic potential energy?

Answer 4

Energy stored in objects squahy and stretchy objetcs

Question 5

equation for kinetic energy

Answer 5

K.E. = 0.5m v2

Question 6

equation for gravitational potential energy

Answer 6

U=m g h gravity is 9.8

Question 7

how much is gravity

Answer 7

9.8

Question 8

What’s the conservation of energy?

Answer 8

Energy cant be created or destroyed, it can only be transformed or transferred chemically, mechanically, heating and radiation

Question 9

equation for thermal energy

Answer 9

Change in thermal energy = mass x specific heat capacity x change in temperature.

Question 10

what’s the equation for elastic potential energy?

Answer 10

U = 0.5ke²

Question 11

what does kΔx stand for

Answer 11

kΔ is the spring constant, and x is the displacement of the object from its rest position.

Question 12

What’s chemical energy

Answer 12

Energy stored in chemical bonds.

Question 13

What’s nuclear energy

Answer 13

: Energy stored in the nucleus of an atom.

Question 14

what’s Electrostatic Energy

Answer 14

Energy due to the interaction of charged particles.

Question 15

What’s Magnetic Energy

Answer 15

Energy due to magnetic fields.

Question 16

How can energy be transferred?

Answer 16

Energy can be transferred mechanically (force doing work)
electrically (charge doing work)
Heating
Radiation (light, sound).

Question 17

Equation for work done

Answer 17

W=F×d (force × distance

Question 18

When is work done?

Answer 18

Work is done when a force moves an object.

Question 19

what’s work measured in?

Answer 19

joules (J).

Question 20

What’s power?

Answer 20

Rate of energy transfer or work done.

Question 21

equation of power

Answer 21

P=E/t or P= W/​t

Question 22

What’s a closed system

Answer 22

A system where no energy or matter enters or leaves.

A well-insulated thermos with hot water in it – no heat escapes, so energy stays inside.

Question 23

E.g of a closed system

Answer 23

A sealed bottle is a closed system: no water or gas can escape

Question 24

What are Fossil Fuels?

Answer 24

Coal, oil and gas.

Question 25

What's renewable energy?

Answer 25

Energy that can be used again and cant run out

Question 26

e.g o renewable energy

Answer 26

sunlight water wind

Question 27

what's non renewable energy?

Answer 27

energy that cant be used again and they run out

Question 28

e.g of non renawable energy

Answer 28

coal oil natural gas nuclear fuels

Question 29

What's a system

Answer 29

a single or group of objects

Question 30

What's Watt

Answer 30

unit of power

Question 31

Equation for effiency

Answer 31

Efficiency = (Useful energy out ÷ Total energy in)× 100

Question 32

Specific Heat Capacity equation

Answer 32

energy = mass × specific heat capacity × temperature change

Question 33

equation for power

Answer 33

Power = energy tranferred÷time or work done÷time

Question 34

energy transfer

Answer 34

Energy can be transferred usefully, stored or dissipated but cannot be created or destroyed

Question 35

equation for energy

Answer 35

power × time

Question 36

what are the 2 types of work done

Answer 36

electrical and mechanical

Question 37

What's chemical work done?

Answer 37

chemical work done is using force to move an object. E.G Kiking a ball- chemical energy store from leg is being transferred to the ekinetic energy to the ball

Question 38

What' electrical work done?

Answer 38

When a current flow. energy requires too overcome the resistance in the wires of the circuit. e.g- in order a train to stop, it applies breaks, which creates friction between brakes and wheels. then it transfers heat to the surrounding.

Question 39

equation for power in terms of energy transfer

Answer 39

P=E÷t p- power E-energy t-time

Question 40

equation for power in terms of work done

Answer 40

P=W÷t p-power W-work done t- time

Question 41

what's power measure in

Answer 41

Watts

Question 42

What's work done measured in

Answer 42

joules

Question 43

what's time measured in

Answer 43

seconds

Question 44

how is heat transferred in solids

Answer 44

heat is transferred through conduction

Question 45

how is heat transferred in liquid

Answer 45

heat is transferred in liquid through convection

Question 46

how is heat transferred in space

Answer 46

heat is transferred in space through radiation

Question 47

Equation for specific heat capacity

Answer 47

Change in thermal energy(J)= mass(m)×specific heat capacity(J/kg○C)× temperature change

Question 48

What's thermal energy

Answer 48

Thermal energy is the total energy requires to change the temperature of an object

Question 49

What's heat capacity

Answer 49

The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1kg of the substance by 1C

Question 50

Formula for theranl energy

Answer 50

Mass×specific heat capacity×temp change

Question 51

Formula for heat capacity

Answer 51

Mass×specific heat capacity

Question 52

What's the law of energy?

Answer 52

Law of energy states that energy can be transferred usefully, stored or dissipated but it cannot be created or destroyed.

Question 53

What's an open system

Answer 53

If a system is open, energy can be transferred into or out of the system. For example, a beaker full of hot water is an open system because heat energy may transfer out of the beaker to the surroundings.

Question 54

What is meant by SYSTEM

Answer 54

System means an object or a group of object

Question 55

What does energy being dissipated meaning

Answer 55

Energy is being Wasted

Question 56

Efficiency meaning

Answer 56

useful energy out / total energy in

Question 57

Open system

Answer 57

Energy can enter or leave the system. e.gA kettle heating water without a lid — heat escapes to the air, so energy leaves the system.

Question 58

What is the formula for calculating work done?

Answer 58

Work done = Force × Distance

Question 59

What is the formula for energy transferred using power?

Answer 59

Energy = Power × Time

Question 59

What is the formula for efficiency?

Answer 59

Efficiency = (Useful energy out ÷ Total energy in) × 100

Question 60

energy is DISSIPATED meaning

Answer 60

Energy is wasted