P1 - Conservation And Dissipation Of Energy Flashcards
Energy can be stored in a Variety of Energy _________.
Stores.
What are the Three Ways Energy can be Transferred?
Heating, Waves or an Electric Current.
How does Thermal Energy describe Energy?
Temperature.
When an Object Falls and Gains ________, its Store of Gravitational ______________ Energy Decreases, and its Kinetic Energy Store ______________.
Speed…Potential…Increases…
What cannot be Created or Destroyed?
Energy.
What is a System in Physics?
An Object or Group of Objects.
Conservation of Energy applies to ALL ________ Changes.
Energy.
What is a Closed System?
A System in which no Energy Transfers take place.
Work is Done on an Object when a _______ makes the Object move.
Force.
Energy Transferred = Work _____
Done.
Work Done (__) = Force Applied (__) x Distance Moved Along The Line Of Action Of The Force (__)
W…F…s
Work Done to overcome Friction is mainly Transferred to Thermal ________ Stores by Heating.
Energy.
The Gravitational _____________ Energy Store of an Object Increases when it moves Up and Decreases when it moves ______.
Potential…Down…
The Gravitational Potential Energy of a Store of an Object ____________ when it is Picked Up.
Increases.
The Gravitational Field Strength of the Moon is less than on the _______.
Earth.
Change In Objects Gravitational Potential Energy Store (__) = Weight (__) x Change In Height (__)
J…N…m…
Change In Gravitational Potential Energy Store (__) = Mass (__) x Gravitational Field Strength (__) x Change of Height (__)
J…KG…N/KG…m
The Energy in the Kinetic _________ Store of a Moving Object depends on its _____ and its Speed.
Energy…Mass…
Kinetic Energy (__) = 0.5 x Mass (__) x Speed(Squared) (__)
J…KG…m/s…
Elastic Potential Energy is the Energy _________ in an Elastic Object when Work is ______ on the Object.
Stored…Done…
Elastic Potential Energy (__) = 0.5 x Spring Constant (__) x Extension(Squared) (__)
J…N/m…m…
Useful Energy is _________ Transferred to where it is wanted in the way it is wanted.
Energy.
Wasted Energy is the Energy that is not usefully _____________.
Transferred.
What does Dissipated mean?
Spread Out.
As _________ Dissipates, it becomes Less Useful.
Energy.
Wasted Energy is ______________ naturally to Surroundings, which are Warmer.
Transferred.
What is Weight Measured in?
Newtons (N).
What is Energy Measured in?
Joules (J).
Energy Supplied to a Device is called _______ Energy.
Input.
Useful Energy Transferred by a Device is called _________ Energy.
Output.
Input Energy (__) = Useful Output Energy (__) + Energy Wasted (__)
J.
Efficiency = Useful Output Energy Transferred By The Device (__) / Total Input Energy Supplied To The Device (__)
J.
No Energy Transfer can be more than _____% Efficient.
100.
Machines Waste Energy because of the ___________ between their Moving Parts, Air Resistance, Electrical Resistance and Noise.
Friction.
_______________ and Gas/Oil Supply most of the Energy you use in your Home.
Electricity.
Electrical Appliances can Transfer _________ in the Form of _________ Energy at the Flick of a Switch.
Energy…Useful…
The More Powerful an ______________ is, the Faster the Rate at which it Transfers ________.
Appliance…Energy…
What is Power in Physics?
Rate of Energy.
Power (__) = Energy Transferred To The Appliance (__) / Time Taken For Energy To Be Transferred (__)
W…J…s…
Efficiency = Useful Power Out / Total Power In (x____%)
100.
Power _________ = Total _______ In - Useful Power Out
Wasted…Power…
