key terms Flashcards

(28 cards)

1
Q

speed

A

How fast something is moving regardless of direction

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2
Q

Displacement(s)

A

How far an object has travelled from it’s starting point in a given direction

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3
Q

velocity(v)

A

The rate of change of an objects displacement

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4
Q

Acceleration(a)

A

The rate of change of an objects velocity

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5
Q

Free fall

A

the motion of an object undergoing an acceleration of g

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6
Q

Transverse waves

A

vibration is at a right angle to the direction of travel

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7
Q

longitudinal waves

A

Vibrations are along the direction of travel

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8
Q

stopping distance

A

thinking distance + braking distance

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9
Q

Galileo said…

A

all objects fall at the same rate (if you ignore air resistance)

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10
Q

friction

A

a force that opposes motion

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11
Q

Terminal velocity

A

when the friction force equals the driving force

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12
Q

density

A

mass per unit volume

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13
Q

pressure

A

force per unit area

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14
Q

Archimedes principle

A

when a body is partially or completely immersed in a fluid, it experiences an upthrust equal to the weight of fluid it has displaced.

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15
Q

moment

A

turning effect of a force

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16
Q

couple

A

a pair of forces

17
Q

power

A

work done per second

18
Q

Hooke’s law

A

extension is proportional to force f=kx

19
Q

Ultimate tensile strength

A

maximum stress a material can take

20
Q

impluse

A

change in momentum

21
Q

Newton’s first law

A

Velocity of an object will not change unless a net force is acts on it

22
Q

Newton’s second law

A

The rate of change of momentum of an object is directly proportional to the net force that acts on the object. f=ma

23
Q

Newton’s third law

A

each force has an equal and opposite reaction force

24
Q

current

A

rate of flow of charge

25
potential difference
work done per unit charge
26
ohms law
if temperature is constant, the current through an ohmic conductor is directly proportional to the p.d. across it
27
Kirchoff's first law
the total current entering a junction = the total current leaving it
28
Kirchoff's second law
the total emf around a series circuit = the sum of the p.d. across each component