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Physics SL > Physics Dictionary > Flashcards

Physics Dictionary Flashcards

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1
Q

Displacement

A

change in position

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2
Q

Distance

A

length of path followed

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3
Q

Acceleration

A

the rate of change of velocity

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4
Q

Instantaneous velocity

A

the average velocity obtained during an interval of time that is very, very small.

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5
Q

Instantaneous speed

A

magnitude of the instantaneous velocity

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6
Q

Average speed

A

total distance travelled divided by the total time taken.

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7
Q

Average velocity

A

change in position (i.e. the displacement) divided by the time taken

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8
Q

Acceleration of free fall

A

an acceleration caused by the attraction between the Earth and the body.

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9
Q

Terminal Speed

A

body moving at constant speed

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10
Q

Weight

A

the result of the gravitational attraction between the mass m of a body and the mass of the planet on which the body is placed

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11
Q

Tension

A

The force that arises in any body when it is stretched

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12
Q

Hooke’s Law

A

The relation between tension and extension

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13
Q

Drag Force

A

forces that oppose the motion of a body through a lid (a gas or a liquid)

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14
Q

Upthrust

A

force experienced by any object placed in a fluid

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15
Q

Free-body Diagram

A

a diagram showing the magnitude and direction of all the forces acting on a chosen body.

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16
Q

Newton’s first law

A 
When the net force on a body is zero, the body will move with 
constant velocity (which may be zero).
17
Q

Order of magnitude

A

an estimate given as just a power of 10

18
Q

absolute uncertainty

A

a quantity giving the extremes a measured value falls within

19
Q

absolute zero

A

the temperature at which all random motion of molecules stops

20
Q

absorption spectra

A

the set of wavelengths of photons absorbed by a substance

21
Q

albedo

A

the ratio of scattered to incident intensity of radiation

22
Q

ammeter

A

an instrument that measures the electric current through it

23
Q

angular speed

A

the ratio of angle turned to time taken

Physics SL (1 decks)

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