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29 Cards in this Set
 Front
 Back
v =

final velocity


x =

displacement


u =

initial velocity


a =

acceleration


t =

time


v =

v = u + at


x =

x = ut + 1/2(at^2)


v^2 =

v^2 = u^2 + 2ax


average velocity =

x/t = (v+u)/2


Acceleration of freefall, at this latitude:

9.81 m s^2


Newton's first law:

'Every object remains at rest or continues with constant velocity unless acted upon by a resultant force.'


gravitational field strength at sea level:

9.81 N kg^1


Mathematical version of Newton's Second law:

F = ma (F = resultant force (if a forward and back force, take back from forward to get resultant.))


Freebody force diagram:

shows all the forces acting on the object whose motion is to be analysed.


momentum equation

momentum = mass x velocity (p = mv). Momentum is a vector quantity.


Newton's Second law:

The momentum change per unit time of an object is equal to the resultant force acting on that object.
rate of change of momentum = resultant force 

Newtons second law formula:

F = (delta(mv))/(delta t)


impulse =

force x time for which the force acts (newton's second law rearranged to F deltat = delta(mv))


force vs time graphs  full area under curve =

total momentum change of the ball = total impulse applied to the ball


PCM

The PRINCIPLE OF CONSERVATION OF MOMENTUM: 'If no external force acts on a system, then the total momentum of the system remains constant.'


Newton's Third Law:

'If body A exerts a foce on body B, the B exert an equal but opposite force on A'


The first force:

1. Gravity. The dominant force in the universe for shaping the large scale structure of galaxies and stars.


The second force:

2. The strong nuclear force: Holds neutrons and protons together inside the nucleus.


The third force:

3. The weak nuclear force: Involved in radioactivity.


The fourth force:

4. The Electromagnetic force: Responsible for attractive and repulsive forces between atoms and is involved in each of the following:
i) Air resistance ii) Contact forces iii) Friction 

The kinematic equations for a body moving in a straight line with uniform acceleration are: (4)

v = u + at
s = ut + 1/2(at^2) v^2 = u^2 + 2as v with line over = (u+v)/2 

The gradient of a displacementtime graph gives...

the velocity of a particle


the gradient of a velocitytime graph gives...
the area between a velocitytime grpah and the time axis gives... 
the acceleration of a particle.
the displacement. 

How is the motion of projectiles analysed?

In terms of two independant motions at right angles. Horizontal component = constant velocity. Vertical is subject to constant acceleration
