P1 - Conservation And Dissipation Of Energy

Question 1

Energy can be stored in a Variety of Energy _________.

Answer 1

Stores.

Question 2

What are the Three Ways Energy can be Transferred?

Answer 2

Heating, Waves or an Electric Current.

Question 3

How does Thermal Energy describe Energy?

Answer 3

Temperature.

Question 4

When an Object Falls and Gains ________, its Store of Gravitational ______________ Energy Decreases, and its Kinetic Energy Store ______________.

Answer 4

Speed…Potential…Increases…

Question 5

What cannot be Created or Destroyed?

Answer 5

Energy.

Question 6

What is a System in Physics?

Answer 6

An Object or Group of Objects.

Question 7

Conservation of Energy applies to ALL ________ Changes.

Answer 7

Energy.

Question 8

What is a Closed System?

Answer 8

A System in which no Energy Transfers take place.

Question 9

Work is Done on an Object when a _______ makes the Object move.

Answer 9

Force.

Question 10

Energy Transferred = Work _____

Answer 10

Done.

Question 11

Work Done (__) = Force Applied (__) x Distance Moved Along The Line Of Action Of The Force (__)

Answer 11

W…F…s

Question 12

Work Done to overcome Friction is mainly Transferred to Thermal ________ Stores by Heating.

Answer 12

Energy.

Question 13

The Gravitational _____________ Energy Store of an Object Increases when it moves Up and Decreases when it moves ______.

Answer 13

Potential…Down…

Question 14

The Gravitational Potential Energy of a Store of an Object ____________ when it is Picked Up.

Answer 14

Increases.

Question 15

The Gravitational Field Strength of the Moon is less than on the _______.

Answer 15

Earth.

Question 16

Change In Objects Gravitational Potential Energy Store (__) = Weight (__) x Change In Height (__)

Answer 16

J…N…m…

Question 17

Change In Gravitational Potential Energy Store (__) = Mass (__) x Gravitational Field Strength (__) x Change of Height (__)

Answer 17

J…KG…N/KG…m

Question 18

The Energy in the Kinetic _________ Store of a Moving Object depends on its _____ and its Speed.

Answer 18

Energy…Mass…

Question 19

Kinetic Energy (__) = 0.5 x Mass (__) x Speed(Squared) (__)

Answer 19

J…KG…m/s…

Question 20

Elastic Potential Energy is the Energy _________ in an Elastic Object when Work is ______ on the Object.

Answer 20

Stored…Done…

Question 21

Elastic Potential Energy (__) = 0.5 x Spring Constant (__) x Extension(Squared) (__)

Answer 21

J…N/m…m…

Question 22

Useful Energy is _________ Transferred to where it is wanted in the way it is wanted.

Answer 22

Energy.

Question 23

Wasted Energy is the Energy that is not usefully _____________.

Answer 23

Transferred.

Question 24

What does Dissipated mean?

Answer 24

Spread Out.

Question 25

As _________ Dissipates, it becomes Less Useful.

Answer 25

Energy.

Question 26

Wasted Energy is ______________ naturally to Surroundings, which are Warmer.

Answer 26

Transferred.

Question 27

What is Weight Measured in?

Answer 27

Newtons (N).

Question 28

What is Energy Measured in?

Answer 28

Joules (J).

Question 29

Energy Supplied to a Device is called _______ Energy.

Answer 29

Input.

Question 30

Useful Energy Transferred by a Device is called _________ Energy.

Answer 30

Output.

Question 31

Input Energy (__) = Useful Output Energy (__) + Energy Wasted (__)

Answer 31

J.

Question 32

Efficiency = Useful Output Energy Transferred By The Device (__) / Total Input Energy Supplied To The Device (__)

Answer 32

J.

Question 33

No Energy Transfer can be more than _____% Efficient.

Answer 33

100.

Question 34

Machines Waste Energy because of the ___________ between their Moving Parts, Air Resistance, Electrical Resistance and Noise.

Answer 34

Friction.

Question 35

_______________ and Gas/Oil Supply most of the Energy you use in your Home.

Answer 35

Electricity.

Question 36

Electrical Appliances can Transfer _________ in the Form of _________ Energy at the Flick of a Switch.

Answer 36

Energy...Useful...

Question 37

The More Powerful an ______________ is, the Faster the Rate at which it Transfers ________.

Answer 37

Appliance...Energy...

Question 38

What is Power in Physics?

Answer 38

Rate of Energy.

Question 39

Power (__) = Energy Transferred To The Appliance (__) / Time Taken For Energy To Be Transferred (__)

Answer 39

W...J...s...

Question 40

Efficiency = Useful Power Out / Total Power In (x____%)

Answer 40

100.

Question 41

Power _________ = Total _______ In - Useful Power Out

Answer 41

Wasted...Power...