Physics Defintions Flashcards

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1
Q

Static Friction

A

force opposes tendency motion stationary object rel to surface

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2
Q

Kinetic Friction

A

force opposes tendency motion moving object rel to surface

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3
Q

Inertia

A

Property resist change in state of rest or const vel

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4
Q

Newtons 1

A

const vel/rest remains until fnet>0

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5
Q

Newtons 2

A

When fnet acts, obj a in direc of fnet. A direc prop fnet inverse prop mass

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6
Q

Newtons 3

A

Obj A exerts force on obj B, obj B exerts = mag opp direc on obj A

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7
Q

Grav

A

Every body attract every other body force direc prop product masses inverse prop square distance between

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8
Q

Coloumbs

A

Electrostatic f of attrac/repulse exerted by one charge on another obj direc prop product charges inverse prop square distance between

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9
Q

Isolated system

A

a system where resultant external force is zero.

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10
Q

Electric Field

A

Region in space where electrostatic charge experiences a force

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11
Q

Electric Field Strength/At a point

A

electrostatic force experienced per unit positive charge placed at that point

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12
Q

Ohms Law

A

Current along a conductor direc prop to potential difference along the conductor provided temp constant

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13
Q

Power

A

Rate at which work is done

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14
Q

Resistance

A

Ratio of potential difference across a resistor to current in the resistor

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15
Q

Potential Difference

A

Energy transferred per unit charge flowing between 2 points through a conductor

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16
Q

Emf

A

Energy provided by battery per unit charge flowing through the battery

17
Q

Internal Resistance

A

Resistance within a battery when current is flowing which causes a decrease in potential difference that the battery can supply to the external circuit

18
Q

Momentum

A

Product of m and v

19
Q

Newtons 2 in terms of momentum

A

The resultant/net force acting on an object is equal to the rate of change of momentum of the object in the direction of the resultant/net force.

20
Q

Impulse

A

product of the resultant/net force acting on an object and the time the resultant/net force acts on the object

21
Q

Elastic Collision

A

A collision in which total momentum and kinetic energy are conserved

22
Q

Projectile

A

obj given vi after which fg only force on it

23
Q

Free fall

A

obj only under fg

24
Q

Work energy theorem

A

Net work done = delta EK

25
Q

Conservative force

A

A force where work done indep path taken (Fg)

26
Q

Conservation emech

A

Emech in isolated system remains constant

27
Q

Doppler

A

Apparent change in frequency of sound detected by listener as result of rel motion between source of sound and listener

28
Q

Use of doppler

A

Doppler Flow Meter - med field for rate of blood flow
Doppler Foetal Monitor - US
Doppler Radar Gun - Speed of moving vehicle

29
Q

Red Shift

A

When star moves away from earth light waves behind star become spread out ie wavelength inc freq dec. Light shifts towards the red end of spectrum

30
Q

Blue Shift

A

When start moves toward earth light waves ahead of star become compressed ie wavelength dec freq inc. Light towards blue end of spectrum

31
Q

Why universe expand?

A

Light from most galaxies observed is redshifted implying expansion