A level physics

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Equation for kinetic energy

1/2mv2

Equation for F

1/T

1000L is how many m3?

1m3

SUVAT equations only work when..

Acceleration is constant

Newtons 1st law

An object at rest or moving at an constant velocity will continue to do so unless acted on by a resultant force

Longitudinal

Displacement of particles are parallel to direction of the wave

Transverse

Displacement of particles are perpendicular to direction of the wave

Define power

Energy/time

NetTorque and NetForce is always 0 in..

Equilibrium

Newtons 3rd law

Every force has an equal & opposite reaction force

Equation for tstress

F/A

Define work done by a force

Force X distance moved in direction of force

Define moment of a force

Force multiplied by the perpendicular distance from the pivot to the line of action of the force

Accurate is..

How far is your value from the real value

Precise is..

How many times you repeat your experiment and get the same value

Phase difference

Is the amount by which 2 points on a wave of wavelength separated by a distance x

Diffraction

Is the spreading of a wave as it passes through a gap or around an edge

Refraction

It happens when light enters a different median and changes directiob

Name of symbol for wavelength

Lambda

Ductile

Material cannot return to its original shape

Path difference for destructive

N X 1/2 X lambda

Path difference for constructive

N X lambda

Reflection

Occurs when waves change direction when they meet an impenetrable barrier and bounce off it

Define torque

One of the forces X by the perpendicular distance between the forces

Examples of longitudinal waves

P waves and sound

Define couple

Pairs of equal and opposite forces that produce rotation, eg steering wheel

Examples of transverse waves

S waves and electromagnetic

Wavelength

The distance between a point on one wave to the same point on the next wave

Tensile stress

The force applied per unit area of the wire

Hookes law

The force applied to an extensible material is directly proportional to its extension

Define pressure

The force per unit area

Define 1 newton

The force requires to love an object of 1 kg with an acceleration of 1 m/s2

Tensile strain

The fractional change in the original length of the wire

Define density

The mass per unit volume

Amplitude

The maximum displacement from rest position

Ultimate tensile strength

The maximum stress that a material can withstand when being stretched

Frequency

The number of waves that pass a given point per second

Newtons 2nd law

The resultant force on an object in a certain direction is directly proportional to the rate of change of momentum of that object in the same direction

For any object to be in equilibrium..

The sum of the clockwise moment has to be equal to the sum of the anti clockwise moment about the pivot

Reaction time is ..

The time taken for driver to react to a stimulant

Why can the efficiency of a mechanical device never be 100%?

This is because of heat/thermal energy

Time period

Time taken for a wave length to complete a full cycle

Equation for young modulus

Tstress/tstrain

Archimedes principle

Upthrust on an object in a fluid is equal to the weight of the fluid displaced

Brittle

When materials cannot be permanently stretched, they break after the elastic limit has been exceeded

Destructive

When the waves are in anti phase and the amplitude cancel out

Constructive

When waves are in phase and the amplitude of them add up

Equation for tsrain

X/l


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