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Physics > P1.6 - Energy, Work, Power & Pressure > Flashcards

P1.6 - Energy, Work, Power & Pressure Flashcards

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1
Q

What are ways energy can be stored? [7]

A
  • kinetic
  • gravitational potential
  • chemical
  • elastic
  • nuclear
  • electrostatic
  • thermal
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2
Q

What is energy? [1]

A

the ability of a body to perform work

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3
Q

What is the principle of conservation of energy? [2]

A

energy cannot be created or destroyed but only passed on from one form to another

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4
Q

What is kinetic energy? [1]

A

energy due to motion - movement energy

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5
Q

What is the unit for energy? [1]

A

Joules (J)

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6
Q

What is the formula for kinetic energy? [2]

A

K.E. = 1/2mv^2

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7
Q

What are the 3 types of potential energy? [3]

A
  • gravitational potential energy (GPE)
  • elastic potential energy
  • electric potential energy
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8
Q

What is GPE? [2]

A
  • energy posessed by the object due to their height
  • height of object from surface of the earth
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9
Q

What is the formula for GPE? [1]

A

GPE = mgh

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10
Q

What is mechanical energy? [1]

A

the sum of kinetic energy and potential energy

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11
Q

What is the formula for mechanical energy? [2]

A

mechanical energy = kinetic energy + potential energy

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12
Q

What is mechanical or electrical work done equal to? [1]

A

the energy transferred

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13
Q

What is the formula for work done? [2]

A

force x distance moved in the direction of the force

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14
Q

What are non-renewable fossil fuels? [3]

A
  • coal
  • oil
  • natural gas
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15
Q

What are renewable energy resources? [5]

A
  • hydroelectric
  • wind
  • geothermal
  • solar
  • biofuels
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16
Q

What is the main source of energy for most energy resources? [1]

A

sun

17
Q

What energy resources don’t need the sun as the source of energy? [3]

A
  • geothermal
  • nuclear
  • tidal
18
Q

How is energy released from the sun? [1]

A

nuclear fusion

19
Q

How is energy released in nuclear reactors? [1]

A

nuclear fission

20
Q

What are the formulas for efficiency? [2]

A

efficiency = (useful energy output / total energy input) x 100

efficiency = (useful power output / total power input) x 100

21
Q

What is power? [2]

A
  • work done per unit time
  • energy transferred per unit time
22
Q

What is the unit for power? [1]

A

Watt (w)

23
Q

What are the formulas for power? [2]

A

power = work done / time taken

power = energy transformed / time taken

24
Q

What is pressure? [1]

A

force per unit area

25
Q

What is the formula for pressure? [2]

A

pressure = force / area

Physics (21 decks)

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