Physics (energy)

Question 1

What are all the 8 energy stores

Answer 1

• thermal,kenetic,gpe,elastic potential,chemical,magnetic,electrostatic,Nuclear

Question 2

What is a system

Answer 2

Single object

Question 3

What happens when a system changes

Answer 3

Energy is transferred. can be away or into system between different objects in system or between different types of energy stores

Question 4

What is a closed system

Answer 4

where neither matter/energy can eneter/leave
next change in total energy-0

Question 5

Energy transferred by heating

Answer 5

Energy is transferred to the system by heating into the system’s thermal energy store which causes temperature to rise

Question 6

Energy transferred by Doing work

Answer 6

Work done energy transferred r the same
-Work done-when current flows(against resistance in circuit)
-by force of moving object

Question 7

how do moving bjects hace enegryin its kenetic energys store

Answer 7

• energy is transfered when obkect speeds up and then away when it slows down
• KES depends on objectsmass& speed faster& larger mass=more energy in KES

Question 8

What is the kinetic energy store equation

Answer 8

Ek=1/2mv^2
Kenetic energy(j)= 1/2 x mass (kg) x speed^2(m/s^2

Question 9

Where do Raised objects store Energy

Answer 9

-GPE stores
Lifting object in gravitational feils neds work - transfer of energy-GPE stores of raised object
- objects mass,height & strength- amount of energy in gpe stores

Question 10

GPE Stores equation?

Answer 10

Ep= mgh
Gpe(j) = mass(kg) x gravitational field strength(N/Kg) x height (m)

Question 11

What energy do falling objects transfer

Answer 11

• GPE store energy tansfered - KES
• when no air resistance:
  Energy lost from GPE store= energy gained from KES

Question 12

What Energy store can stretching transfer to

Answer 12

• EPE stores

Question 13

Equation for elastic potential energy stores (EPE stores)

Answer 13

• if limit of proportion has not been exceeded energy in EPE store found with
  Ee=1/2Ke^2
  EPE(j)=1/2 x spring constant ( N/m) x Extension^2(m)

Question 14

Materials heat capacities

Answer 14

• more energy - transfered to TES of some materials - increase temp
• materials that need to gain alt of energy in TES - warm up -also transfer alot enegry when cool down again - can store lots of energy

Question 15

what is specific Heat capacity

Answer 15

• amount of energy needed to raise temp of 1 kg of substance bt 1degrees celcius