# AQA Physics Unit 2

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Newtons First Law
The velocity of an object will not change unless a resultant force acts on it
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Newtons Second Law
F=ma
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Newtons Third Law
If an object A exerts a force on object B, then object B exerts an equal but opposite force on object A
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Scalar
Distance,Speed,Mass
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Vector
Displacement,Velocity,Acceleration
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Hooke's Law
The extension is proportional to the force applied as long as the limit of proportionality not exeeded
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Young's Modulus
Stiffness constant of a material
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Longitudinal Waves
The parts of the wave oscillate parallel to the direction of travel
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Transverse Waves
The parts of the wave oscillate perpendicular tot he direction of travel
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Stationary Waves
A wave reflects to make two waves travelling in opposite directions with similar amplitude and frequency to superpose to make a stationary wave with nodes and anti nodes
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Monochromatic
Single wavelength
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Coherent
Same frequency/wavelength and a constant phase relationship
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Diffraction
Spreading out of a wave when passed through a slit of around an obsical
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Principle Of Superposition
The resultant displacement caused by 2 waves arriving at a point is the vector sum of the 2 displacements caused by each wave at that instant
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Node
Point with zero displacement with no amplitude
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Anti Node
Point with maximum displacement/amplitude
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Refraction
Change of direction of a wave when it propagates through a different medieum
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## Other cards in this set

### Card 2

F=ma

#### Back

Newtons Second Law

### Card 3

#### Front

If an object A exerts a force on object B, then object B exerts an equal but opposite force on object A

### Card 4

#### Front

Distance,Speed,Mass

### Card 5

#### Front

Displacement,Velocity,Acceleration