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Physics Year 10 🙈🤷 > P1 > Flashcards

P1 Flashcards

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1
Q

Energy can only be….

A

Transferred, it can’t be created or destroyed

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2
Q

What is the equation for work done?

A

Force x Distance

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3
Q

What is the equation for gravitational potential energy?

A

Mass x Gravitation fields strength (9.81 on earth) x height

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4
Q

What is the equation for kinetic energy?

A

1/2 x mass x (speed^2)

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5
Q

What is the equation for elastic potential energy?

A

1/2 x spring constant x extension^2

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6
Q

What is the equation for energy efficiency?

A

Useful energy/ total energy x 100

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7
Q

Name one way machines can lower waste energy…

A

Adding lubricants to reduce friction or installing thermal insulation

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8
Q

What is one Watt equal to?

A

1 J/s

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9
Q

Name the main energy types?

A 
Kinetic
Thermal
Sound
Light
Chemical
GPE 
Elastic potential
Nuclear
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10
Q

How do you calculate wasted energy/power?

A

Total energy/power - useful energy/power

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11
Q

What is hookes law?

A

Force is directly proportional to the extension of a spring until it reaches its elastic potential.

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12
Q

What happens to wasted energy such as heat energy in a car engine?

A

It gets dissapated.

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13
Q

What is the input energy?

A

The energy supplied to the device.

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14
Q

Why can you not get over 100% efficiency?

A

You can’t end with more energy than you started with as energy can’t be created.

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15
Q

What is one of the most efficient electrical appliance that you could have?

A

A heater or a radiator

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16
Q

What type of energy is food energy?

A

Chemical energy

17
Q

What is kinetic energy?

A

Energy transferred through movement.

18
Q

What is the unit of power?

A

W

19
Q

What is the unit of energy?

A

J

20
Q

What is the unit of mass

A

Kg

21
Q

What is the unit of time?

A

Seconds (s)

22
Q

Is work done equal to energy?

A

Yeah courssseeeee

23
Q

What is the equation for force applied to a spring

A

Force applied to a spring(N) = spring constant (N/m) x extension (m)

24
Q

What is a system

A

An object or group of objects

Physics Year 10 🙈🤷 (25 decks)

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