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Physics 2 > Key Words > Flashcards

Key Words Flashcards

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1
Q

momentum

A

property of moving objects

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2
Q

resultant force

A

number of forces acting at a point replaced by a single force that had the same effect on the motion as the original froces

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3
Q

gradient of distance-time graph shows us?

A

speed

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4
Q

velocity=

A

speed in a given direction

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5
Q

gradient of a velocity-time graph represents

A

accleration

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6
Q

stopping distance

A

thinking distance + braking distance

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7
Q

thinking distance=

A

drivers reaction time

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8
Q

braking distance=

A

distance traveled under the braking force

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9
Q

terminal velocity=

A

when resultant force is zero and object moves at constant speed

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10
Q

force applied to an elastic object results in

A

object stretching and storing elastic potential energy

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11
Q

work done=

A

force causes and object to move through a distance.

ENERGY IS TRANSFERED

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12
Q

conservation of momentum=

A

total momentum before an event is equal to the total momentum after the event

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13
Q

current=

A

flow of electrical charge

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14
Q

potential difference=

A

work done per coulomb of charge that passes between points

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15
Q

Ohm’s Law=

A

current through a resistor is proportional to voltage provided the temp is constant

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16
Q

what is a filament lamp?

A

contains thin coil of wire (filament) heats up when electrical current is present produces light

17
Q

In a filament lamo as temp increases…

A

resistance increases

18
Q

current in series

A

same current flows through

19
Q

potential in series

A

total p.d shared between them

20
Q

the current through a diode flows in one direction only so..

A

the diode has a very high resistance in the reverse direction

21
Q

resistance of light dependent resistor decreases as

A

light intensity increases

22
Q

resistance of a thermistor decreases as

A

temperature increases

23
Q

mains electricity is an a.c supply and has a frequency and voltage of..

A

50 Hertz

230 V

24
Q

3 wires in a three core cable

A

Earth (green and yellow)
Neutral (blue)
Live (brown)

25
Q

when current exceeds rating of the fuse

A

fuse melts and breaks the circuit

26
Q

what are RCCB

A

Residual Current Circuit Breakers

27
Q

how do RCCB’s work?

A

detect a difference in the current between live and neutral wirse and break

28
Q

isotope=

A

element with same number of protons, different number of neutrons

29
Q

radioactive=

A

substances that give out radiation from the nuclei

30
Q

origins of background radiation=

A

natural: rocks, cosmic rays from space

Man-made: nuclear accidents, fall out from nuclear weapon tests

31
Q

Alpha Particles=

A

4

2

32
Q

Beta Particles=

A

0

-1

Physics 2 (2 decks)

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