P1: Conservative And Dissipation Of Energy

Question 1

What is the conservation of energy?

Answer 1

Energy can’t be created or destroyed, only transfered from one type to another

Question 2

What is work?

Answer 2

Work done is energy Transferred

Its when a forces makes an object move

Question 3

What is power?

Answer 3

The rate of doing work(speed)

Measured in Wats(W)

Question 4

Equation for work(J)

Answer 4

Force x distance

Question 5

Equation for power

Answer 5

Energy/time

Question 6

What are the four carriers or energy transfer pathways?

Answer 6

Radiation
Mechanical work
Electrical work
Heating

Question 7

What are the 8 types of energy store?

Answer 7

magnetic.
internal (thermal)
chemical.
kinetic.
electrostatic.
elastic potential.
gravitational potential.
nuclear.

Question 8

What is the principle of conservation of energy?

Answer 8

Energy can’t be created or destroyed it can only be transfered from one type to another

Question 9

Shat does potential mean?

Answer 9

A store

Question 10

Is light an energy store?

Answer 10

No because light is a transfer of energy not a source

Question 11

How can energy be stored?

Answer 11

In a variety of diffrent energy stores

Question 12

How is enegy transferred when it moves an object?

Answer 12

• heating
• waves
• electrical current
• force

Question 13

When an object falls an gains speed what increases and decreases?

Answer 13

Kenetic energy increases

Gravatational potential energy decreases

Question 14

What happens when a falling object hits the ground without bouncing?

Answer 14

Its kenetic energy store decreases

-thermal energy store of the surroundings increase

Energy is also transfered by sound waves

Question 15

What is a closed system?

Answer 15

A sustem where no energy transfers take place out if or into rhe enerfy stores of the system

Question 16

Can energy be transferred between energy stores in a closed system

Answer 16

Yes

Question 17

What is the equation for work done?

Answer 17

Force x distance moved

Question 18

What is the equation for the change in gravatational potential energy store in an object?

Answer 18

E= m x g xg

Question 19

What does the kenetic energy of an object depend on?

Answer 19

Is mass and speed

Question 20

What is the equation of kernetic energy store of an object?

Answer 20

0.5 x mass x velocity squared

Question 21

What is the eleastic potential energy of an object?

Answer 21

The energy stored in an elastic object when its doing work

Question 22

What is the equation for the elastic potential energy stored in a spring?

Answer 22

0.5 x kenetic x energy squared

Question 23

What is useful energy?

Answer 23

Energy in the place we want and the form we need it

Question 24

What is wasted energy?

Answer 24

Not useful energy, transferred by an undesired pathway

Question 25

What is the effciency of a device?

Answer 25

Iseful energy rptransferred by the device divided by total energu supplied to the device

X 100

Simple ex: Useful divided by total

X100

Question 26

Power of an appliance?

Answer 26

P = e dived by t

Question 27

Effciency of an appliance?

Answer 27

Useful power out divided by total power in

X100

Question 28

Power wated by an appliance?

Answer 28

Total power input-useful power in put

Question 29

Gravatational potential energy equation?

Answer 29

Mass x gravity x height

Question 30

Kenetic energy equation?

Answer 30

0.5 x mass x velocity squared

Question 31

Elastic energy equation?

Answer 31

0.5 sping constant(k) x extention (e) squared

Question 32

Work equation

Answer 32

Force x distance

Question 33

Energy equation

Answer 33

Power x time