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Physics > P1: Energy > Flashcards

P1: Energy Flashcards

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1
Q

Chemical energy?

A

Energy stores include fuels, food or the chemicals found in betteries. The energy is transferred during chemical reactions

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2
Q

Kinetic Energy?

A

Energy stores describe the energy an object has because it is moving

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3
Q

Gravitational potential energy?

A

Energy stores are used to describe the energy stored in an object because of its position, such as an object above the ground

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4
Q

What happens when energy is transferred?

A

When energy is transferred to an object, the energy is stored in one of the objects energy stores

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5
Q

Kinetic energy equation?

A

1/2mv squared

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6
Q

Elastic potential energy equation?

A

1/2 kx squared

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7
Q

Gravitational potential energy equation?

A

mgh

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8
Q

Define specific heat capacity?

A

The amount of energy needed to raise the temperature of 1 kilogram of a substance by 1 degree Celsius

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9
Q

Units for specific heat capacity?

A

Joules/degree celsius/kilogram

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10
Q

Define power?

A

The rate at which energy is transferred

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11
Q

State 2 equations for power?

A

Power = energy transferred/time
Power = work done/time

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12
Q

Unit for power?

A

Watt (W)

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13
Q

Energy changes when a ball is thrown upwards?

A

Upwards: KE is converted to GPE
Peak: Maximum GPE, zero KE
Downwards: GPE is converted to KE

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14
Q

Examples of chemical energy stores?

A

Food
Fuel
Batteries

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15
Q

State 4 different energy stores?

A

Kinetic energy
Gravitational potential energy
Elastic potential energy
Chemical energy

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16
Q

State the law of conservation of energy?

A

Energy cannot be created or destroyed (it can only be transferred into different forms)

17
Q

What is waste energy?

A

The energy that is not used by the device for its desired purpose

18
Q

Describe energy changes that occur in a light bulb?

A

Electrical energy is transferred into light and heat energy
Light is a useful energy form, heat is waste energy

19
Q

State 2 equations to calculate efficiency?

A

=Useful output energy transfer/total input energy tansfer

=useful power output/total power output

20
Q

How can efficiency of a system be increased?

A
  1. Reducing waste energy
  2. recycling wast output

Physics (11 decks)

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