physics paper 2
forces
waves
magnetisum and electromagnetisum
scalar quantites have size and no direction
vector quantities have both size and direction
a force is a push or a pull
weight=mass*gravitational field strength
the centre of mass is the point at which an objects mass is centered at
a resultant force that can replace all over force acting upon an object
work done=force*distance moved
force=spring constant*extension
hooks law: Extension is directly proportional to force applied as long as the limit of proportionality is not exceeded
elastic potentital energy is the energy stored in a system which means when work is done it will change its shape
0.5spring constantextension squared
a wave is the movement of energy
transverse waves are when the displacement is at right angles to the direction of the wave
longitudinal waves are when the displacement is parallel to the direction of the wave
amplutitude is "how high" a wave is
wave length is the distance between to corrspounding points on the wave
frequency is how many waves pass by each secound
required practicles
wave speed=wavelength*frequency
wavefrounts are the crest of the wave when viewed from above
angle of incidence=angle of reflection
refraction
what is terminal velocity?
give one danger of x rays and gamma rays
give one danger of invisible light
permanent magnets
always have a magnetic field around them
can attract or repel other magnets
induced magnets
only become magnetic when in a magnetic field
can only attract magnetic metals not repel them
a field is a region were force will act
the magnetic field around a wire becomes weaker as you move further away and as the current is increased
electromagnetic
the strength of an electromagnetic can be increased by increasing the voltage increasing the number of coils and inserting an iron core
what is an electromagnet
what is a compass
two example of an electromagnet
force and acceleration
dependent the exceleration needed to move an object with a larger mass
independent the mass of car
acceleration =change in velocity /time
force and extension of a spring
the extension of the spring when different forces are applied
independent the force applied to a spring
waves in a tank
dependent the effect upon the waves that power has
independen the power that the tank is supplied with
waves in a solid spring
dependent the effect and relationship between wave length frequency and wave speed
independent the vibrations applied
surfaces and radiation
independent the surfaces and colours
dependent the effect of different surfaces and colours
light changes direction when it changes speed
light slows down as it enters the block bending towads the normal
light speeds up as it leaves the block making it bend away from the normal
if the ray of light enters along the normal it looks the samwe
is a magnet in which its magnetic field is produced by an electric current
the constant speed a falling object eventually reaches meaning it will not decrease in speed however it will not increase in speed
speakers and car breaks and speakers