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Physics > P1 > Flashcards

P1 Flashcards

1
Q

Gravitational potential energy

A

Energy store

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2
Q

Maximum kinetic energy

A

Energy transfer

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3
Q

How does conservation of energy work?

A
  1. Maximum gravitational potential energy
  2. Maximum kinetic energy
  3. Maximum gravitational potential energy
  4. Then does the same the opposite way
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4
Q

What is the principle of conservation of energy?

A

Energy cannot be destroyed or created

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5
Q

What is work done

A

To move an object with an applied force

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6
Q

Formula for work done

A

Work done(j) = force(n) x distance(m)

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7
Q

Gravitational potential energy

A

The energy that a body has due to its height above the ground

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8
Q

Formula for change in gravitational potential energy

A

Change in gravitational potential energy = mass x gravitational field strength x change in height

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9
Q

What are the energy stores?

A

Chemical - batteries
Kinetic - moving object
Gravitational - due to position of object
Elastic - stretched or compressed spring
Thermal - warm object
Magnetic - attract/repelling
Electrostatic - two charges repelling or attracting
Nuclear - through radioactive decay

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10
Q

Energy transfers

A

Mechanical - when a force moves through a distance
Electrical
By heating - temperature difference
By radiation - microwaves, sound

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11
Q

Efficiency

A

The amount of input energy that is transferred to useful energy for a device

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12
Q

Formula for efficiency

A

Percentage efficiency = useful output divided by total imput x 100%

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13
Q

What is power

A

The amount of work done per second

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14
Q

Formula for power

A

Power = work done divided by time

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15
Q

What is the unit of power

A

Watts

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16
Q

Kinetic energy eqation

A

Kinetic energy(j) = 1/2 x mass x speed

17
Q

Elastic potential energy equation

A

Elastic potential energy = 1/2 x spring constant x extension

18
Q

Whats the highest efficiency percentage?

A

100%

19
Q

What is useful energy

A

Energy transferred to where it is wanted in the way it is wanted

20
Q

What is wasted energy

A

Energy that is not usefully transferred

21
Q

Where does the wasted energy go?

A

It is eventually transferred to the surroundings, making it warmer

22
Q

What happens after the energy is dissipated?

A

It gets less and less useful

Physics (4 decks)

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