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Science > Physics > Flashcards

Physics Flashcards

1
Q

Speed =

A

Distance/time

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2
Q

Average acceleration=

A

Change in velocity/time taken

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3
Q

2nd law of motion

A

F=ma

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4
Q

3rd law of motion

A

Whenever an object exerts a force on an object there is an equal and opposite reaction

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5
Q

Electricity is a flow of

A

Elections

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6
Q

Flow of electric current depends on

A

Potential difference and current and resistance

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7
Q

Voltmeter measures

A

Potential difference in volts

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8
Q

Circuit flowing is measured in

A

Amps using a ammeter

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9
Q

Resistance is measured in

A

Ohms

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10
Q

As volt increase the current

A

Increase

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11
Q

Electricity is produced when a conductor is connected to the positive and negative terminators of a power source like battery and electron flow to the positive/negative terminal

A

Positive terminal

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12
Q

As voltage increase, current and resistance :

A

Increase

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13
Q

Light travels

A

300,000 km/s

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14
Q

What colour is an object if they reflect, absorb all light?

A

Black or white

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15
Q

Angle of reflection:

A

Angle of incidence, angle of reflection, critical point, total internal refraction, normal

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16
Q

Concave makes things

A

Focused on a single point, all light is converged to be concentrated to a sharp image

17
Q

Convex makes image

A

More of image is seen

18
Q

What is refraction?

A

The change of direction when light enters from one medium to another

19
Q

Law of reflection states that:

A

Light waves bounce back off the surface at the same angle that they strike the surface.
Angle of incident = angle of reflection

20
Q

Refraction is bending of

A

Light

21
Q

Electromagnetic spectrum allows us to

A

Communication, exploration universe and medicine

22
Q

Optical fibres make use of visible light to transmit messages over long distance why is it better?

A

Cheaper, little energy, smaller tubes, faster

23
Q

Optical fibre:

A

Thin, glass core, protective jacket, total internal reflection, more info than copper wires

24
Q

Isotopes have same number of protons but different number of

A

Neutrons

25
Q

Alpha particles can be stopped by paper t/f?

A

True

26
Q

Nuclear reactions found in sun are

A

Nuclear fusion

27
Q

Nuclear fusion:

A

Fusing two lighter atoms to a heavier one
Occurs naturally in stars
High density and temp
Extremely high energy to overcome electrostatic repulsion
Hydrogen bomb

28
Q

Nuclear fission:

A

A neutron strikes a uranium nucleus which break into fragments. Free neutron stile other uranium nucleus creating a chain reaction
Doesn’t occur naturally
Little energy
Atomic bomb

29
Q

Half life

A

Time taken for half of the nuclei to decay

30
Q

Nebula

A

Large clouds of solar gases and stellar dust

31
Q

Protostar

A

When cloud of gas cool and collapses begins to heat up

32
Q

Quasars

A

Remote, dense, radio wave emiting dead star, light emiting

33
Q

Inertia

A

The tendency of a body to maintain its state of rest or uniform motion in straight line until acted upon an opposite force

34
Q

Neutralisation define

A

To stop something from having an effect

35
Q

Decplacement reactions take place when

A

one metal pushes a compound and take its place

36
Q

When metal reacts with acid:

A

Metal+hydrochloric acid > salt + hydrogen

37
Q

In order for metal to react with acid it must be BEFORE OR AFTER hydrogen

A

Before

38
Q

Types of galaxies

A

Elliptical
Spiral
Irregular
Barred spiral

Science (5 decks)

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