A level physics
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
