Mechanics

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  • Created by: Jawike
  • Created on: 13-05-18 13:20
you are given: s, u, t, a what equation do you use?
s = ut + 1/2at^2
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you are given: v, u, a, s what equation do you use?
v^2 = u^2 + 2as
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you are given: v, u, a, t what equation do you use?
v = u +at
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you are given: s, u, v, t what equation do you use?
s = 1/2(v+u)t
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Newtons 1st law
a body will remain in the same state of motion unless acted upon by an unblalanced force.
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Newtons 2ndlaw
Σf = ma
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Newtons 3rd law
(forces act in pairs) if body A exerts a force on body B, body B will exert force equal in magnitude but opposite in direction to A
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w = mg
(weight = mass x gravity) can be used whenever we are resolving a vertical force on earth
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pulleys
2 (Σf=ma equations), where acceleration must be opposite, tension is the force opposite to friction/gravity, and can be found using Σf=ma
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vectors, method 1 (tip and tail)
join the forces end to end, works best if forces are at right angels, use Trig to find angles, and pythagorus to fing magnitude
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vectors, method 2 (cosine rule)
add the forces end to end, and use the cosine rule to find the angle and magnitude from the object
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vectors, method 3 (co-plannar)
break up the forces into their horisontal and vertical componants, take the sum of the vertical and horisontal componants, and use trig and pythagorus to find the resultant force
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Ek = 1/2mv^2
kinetic energy = 1/2 mass x velocity^2
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displacement time graphs
gradient: velocity area beneath curve: N/A
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velocity time graphs
gradient: acceleration area beneath curve: displacement
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acceleration time graphs
gradient: N/A area beneath curve: velocity
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force body diagrams
a dot, in the middle represents the object it act's as as a particle (it has no volume), the forcesare shown as arrows with e their respective direction, and mtheir magnitude is displayed by the length of the arrow
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terminal velocity
this is the fastest an object due to resistive forces, e.g drag/ friction
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P= mv
momentum = mass x velocity in a contained collision( no external force) momentum is always conserved P(before)=P(after)
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Card 2

Front

you are given: v, u, a, s what equation do you use?

Back

v^2 = u^2 + 2as

Card 3

Front

you are given: v, u, a, t what equation do you use?

Back

Preview of the front of card 3

Card 4

Front

you are given: s, u, v, t what equation do you use?

Back

Preview of the front of card 4

Card 5

Front

Newtons 1st law

Back

Preview of the front of card 5
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