NEED IMPORTANT FORMULAS FROM
1) WORK, ENERGY AND POWER
2)MOTION IN A STRAIGHT LINE
THE DESERVING GETS 50 POINTS...
NEED ALL THOSE FORMULAS WHICH IS REQUIRED TO SOLVE IMPORTANT QUESTIONS
1) WORK, ENERGY AND POWER
2)MOTION IN A STRAIGHT LINE
THE DESERVING GETS 50 POINTS...
NEED ALL THOSE FORMULAS WHICH IS REQUIRED TO SOLVE IMPORTANT QUESTIONS
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W=F×s
P.E=mgh
K.E=1/2×mv^2
P=W/t
for motion
speed =distance/time
velocity=displacement/time
v=u+at
2as=v^2-u^2
s=ut+1/2×at^2
There are four variables which put together in an equation can describe this motion. These are
Initial Velocity (u);
Final Velocity (v),
Acceleration (a),
Distance Traveled (s)
and
Time elapsed (t).
The equations which tell us the relationship between these variables are as given below.
v = u + at
v2 = u2 + 2as
s = ut + 1/2 at2
average velocity = (v + u)/2
Of course, these equations are applicable only if acceleration is constant.
[1].
a). Work = Force • Displacement • Cosine(theta)
W = F • d • cos(theta)
b).
Power = Work / time
P = W / t
P = F • cos(theta) • (d/t)
P= F • v • cos(theta)
c).
Kinetic and Potential Energies
PE(grav )= m•g•h
KE = 0.5 • m • v2
d).
Work-Energy Connection
There is a relationship between work and total mechanical energy. The relationship is best expressed by the equation
TMEi + Wnc = TMEf
The mechanical energy possessed by a system is the sum of the kinetic energy and the potential energy. Thus the above equation can be re-arranged to the form of
KEi + PEi + Wnc = KEf + PEf
0.5 • m • vi2 + m • g • hi + F • d • cos(theta) = 0.5 • m • vf2 + m • g • h(f)
The work done to a system by non-conservative forces (Wnc) can be described as either positive work or negative work. Positive work is done on a system when the force doing the work acts in the direction of the motion of the object. Negative work is done when the force doing the work opposes the motion of the object.