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