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science > Physics Equations > Flashcards

Physics Equations Flashcards

1
Q

Desnity

A

Mass/volume

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2
Q

Speed

A

Distance/time

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3
Q

Velocity

A

Distance/time

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4
Q

Acceleration

A

Change in velocity/time taken

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5
Q

Weight

A

Mass x 10 N/kg

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6
Q

Pressure

A

Pressure is force per unit area

Pressure = force divided by area

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7
Q

Current

A

The flow of electric charge (electrons)

Measured in amps (A)

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8
Q

Potential difference

A

Voltage- is the difference in electrical pressure.

Measured in volts.

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9
Q

Resistance

A

The ability that a substance has to resist the flow of electricity in a circuit.
Measured in ohms.

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10
Q

Ohms law

A

Electric current is proportional to voltage

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11
Q

Diode

A

A device that allows current to flow in one direction only

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12
Q

When will electricity flow in a circuit

A

If there is a complete circuit and potential difference

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13
Q

Static electricity

A

Non- moving electricity produced by friction.

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14
Q

Magnetic field

A

The space around which a magnet exerts a force

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15
Q

Refraction

A

The bending of light when it travels from one transparent substance to another

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16
Q

Light

A

A form of energy and can be converted from one form to another

17
Q

Insulator

A

A substance that does not allow heat to move through it easily

18
Q

Latent heat

A

The heat taken in during melting and boiling

19
Q

What things does heat depend on

A

The temoerature, mass and the nature of the substance

20
Q

Radiation

A

The transfer of heat in rays, from a hot body without needing a medium to travel through. Radiation travels in straight lines at the speed of light.

21
Q

Convection

A

The movement of heat through liquids and gases. The particles in the liquid or gas move and carry the heat from one place to another.

22
Q

Conduction

A

The movement of heat through a substance withou the substance moving.

23
Q

When does ice expand

A

When cooled below 4 degrees

24
Q

What does the pressure in a liquid depend on

A

The height of the liquid above, and on the density of the liquid.

25
Q

Power

A

The amount of work done per second

26
Q

1 watt

A

1 joule per second

27
Q

Work done

A

Force x distance moved

28
Q

Energy

A

The ability to do work

29
Q

Power

A

The amount of work done per second

30
Q

1 watt

A

1 joule per second

31
Q

Work done

A

Force x distance moved

32
Q

Energy

A

The ability to do work

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