physics

• what is energy


  the ability to exert a force causing displacement of an object
• what is kinetic energy 


  energy of movement
• what is the kinetic energy formular


  1/2xmassxheight=J
• what is GPE


  stored energy
• what is GPE formula

  mass x gravity x height=kJ
• what are types of kinetic energy

  thermal,electrical,mechanical,magnetic
• what are examples of GPE

  chemical,nuclear,gravitational,elastic
• what is energy efficiency

  it measures the proportion of energy which is wasted
• what is transfer


  the same type of energy moving to a diffrent object
• what is transformation


  one type of energy changing to a different type
• what is work


  the transfer of energy by a force acting on an object as its displaced
• what is works equation

  force applied x distance moved
• what is elastic potential energy


  energy stored as a result of applying a force to deform an elastic object 1/2 x k x x squared
• what is waste


  energy in the form of heat and sound energy can be formed in the transformation
• explain newtons first law

  if an object is at rest it will remain rest,and an object in motion stays in motion at a constant speed unless acted on by a unbalanced force
• what is net force

  the sum of all forces acting on a object (mass x acceleration)
• what is force


  a push/pull,twist,reshape change in speed
• what is inertia

  resistance of an object to change until a force acts on it.
• what is the equation of force

  mass x acceleration
• explain newtons second law

  when the acceleration of an object is directly related to the net force and inversely related to its mass
• explain mass


  the amount of matter that makes up an object
• explain weight


  the force of gravity acting on a object
• explain newtons third law

  for every action force,there is an equal and opposite reaction
• example of newtons third law

  if a horse is pushing a cart, the ground is pushing against the horses hooves causing it to move forward
• explain distance


  how far an object has travelled in a set time
• explain displacement


  the final distance and direction of the objects from its starting point
• scalar quantity


  a quantity that has only size (speed,distance)
• explain vector quantity


  a quantity that has both size and direction ( velocity,displacment)
• explain speed


  a measure of how fast an object is travelling ( measures in SI units of meters per second) (m/s or ms-1 )
• what are the three equations for the speed triangle


  sav=d over t , t=d over sav ,d=sav x t
• what equation do you you use to find the average speed


  sav= d over t
• what is the acceleration formular

  change in velocity over change in time
• explain velocity


  speed in a particular direction (m/s)
• explain magnitude 


  how big the size of a movement was.
• what are the three acceleration equations

  a=v-t over triangle t, v-u=a x triangle t, triangle t= v-u over a
• what happens to an objects speed if it travels with zero acceleration

  its speed must remain constant
• describe a situation where inertia affects the motion of an objects

  if a trolley has a larger mass it will be harder to push than a trolley that has a smaller mass
• calculate the force required to accelerate a 35kg scooter at 2m/s squared

  f=m x a , f=35 x 2 , f=70N
• a force of 40N acts on a trolley that has a mass of 5kg, what is the acceleration of the trolley


  a=f over m,a= 40over 5=8m/s sqaured
• an acceleration of 3m/s squared is produced when a force of 13.5N acts on a cart,calculate the mass of the cart

  m= f over a ,m=13.5 over 3=35m/s squared