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29 Cards in this Set
- Front
- Back
v =
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final velocity
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x =
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displacement
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u =
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initial velocity
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a =
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acceleration
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t =
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time
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v =
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v = u + at
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x =
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x = ut + 1/2(at^2)
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v^2 =
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v^2 = u^2 + 2ax
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average velocity =
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x/t = (v+u)/2
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Acceleration of freefall, at this latitude:
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9.81 m s^-2
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Newton's first law:
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'Every object remains at rest or continues with constant velocity unless acted upon by a resultant force.'
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gravitational field strength at sea level:
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9.81 N kg^-1
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Mathematical version of Newton's Second law:
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F = ma (F = resultant force (if a forward and back force, take back from forward to get resultant.))
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Free-body force diagram:
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shows all the forces acting on the object whose motion is to be analysed.
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momentum equation
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momentum = mass x velocity (p = mv). Momentum is a vector quantity.
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Newton's Second law:
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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 |
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Newtons second law formula:
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F = (delta(mv))/(delta t)
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impulse =
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force x time for which the force acts (newton's second law rearranged to F deltat = delta(mv))
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force vs time graphs - full area under curve =
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total momentum change of the ball = total impulse applied to the ball
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PCM
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The PRINCIPLE OF CONSERVATION OF MOMENTUM: 'If no external force acts on a system, then the total momentum of the system remains constant.'
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Newton's Third Law:
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'If body A exerts a foce on body B, the B exert an equal but opposite force on A'
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The first force:
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1. Gravity. The dominant force in the universe for shaping the large scale structure of galaxies and stars.
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The second force:
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2. The strong nuclear force: Holds neutrons and protons together inside the nucleus.
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The third force:
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3. The weak nuclear force: Involved in radioactivity.
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The fourth force:
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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 |
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The kinematic equations for a body moving in a straight line with uniform acceleration are: (4)
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v = u + at
s = ut + 1/2(at^2) v^2 = u^2 + 2as v with line over = (u+v)/2 |
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The gradient of a displacement-time graph gives...
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the velocity of a particle
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the gradient of a velocity-time graph gives...
the area between a velocity-time grpah and the time axis gives... |
the acceleration of a particle.
the displacement. |
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How is the motion of projectiles analysed?
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In terms of two independant motions at right angles. Horizontal component = constant velocity. Vertical is subject to constant acceleration
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