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41 Cards in this Set
- Front
- Back
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Equations of motion |
v = u + at v²=u²+2as S= ut + ½at² s = v+u/2 x t |
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Determination of acceleration due to gravity |
s=1/2 gt² |
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Work |
w=f*s where f is force and s is distance
w=f*s cosΦ |
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Work done in a force field |
Work = force * distance = mgh w=mgh |
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Elastic Potential Energy |
½ke² Where k is the elastic potential of the spring |
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Kinetic energy |
½mv² |
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Conservation law of mechanical energy |
mgh = ½mv² v=√2gh The greatest height h=v²/2g |
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Power Average power |
P = w/t , where w=f*s P =work done or energy / time taken |
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Watts and horse power |
1h.p = ¾kw 4/3h.p =1kw |
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Linear expansivity |
α = L2 - L1 / L1(Φ2-Φ1)
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Area expansivity |
β = A2 - A1 /A1 (Φ2-Φ1)
Therefore; A2= A1(1+βΦ) |
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What is the formula for Coefficient of apparent expansivity ? |
Mass expelled / mass left x temperature change
m2 - m1 / (m3 - m1) (Φ2 - Φ1)
m1= mass of empty bottle m2= mass of bottle + liquid m3= mass of bottle + liquid left (m2-m3) = mass of liquid expelled (m3-m1)=mass of liquid left in the bottle |
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Time of flight |
T= 2usinΦ / g
t = usinΦ / g ;Time taken to reach maximum height |
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Upthrust |
Upthrust = V/2 x density of liquid
Upthrust = loss in weight |
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Relative density |
Density of substance / density of water
Mass of substance / mass of equal volume of water
Weight of substance / weight of equal volume of water |
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What is the formula for pressure in fluils |
P = F/A |
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What is the formula for pressure in liquids |
P = phg P = w/A =mg |
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SHM |
T = 2π√L/g For a loaded spring T = 2π√m/k |
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Angular velocity |
w = Φ/t Φ = s/r |
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Period |
T = 2π/w |
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Frequency |
f = 1/T = w/2π |
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Linear velocity |
v = wr |
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What is the formula for acceleration of simple harmonic motion |
w²r |
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newton's 3rd law of motion |
V = -mv / M Where M is the mass of the gun m1u1+ m2u2 = (m1+m2)v m1u1 + m2u2 = m1v1+ m2v2 |
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Impulse of a force |
F = m(v-u) / t
Ft = m(v-u) Where ft is equal to the impulse I of the force
I = Ft = change in momentum
F = m(v-u) / t
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Weight of a body |
w = mg
w = mg = R ; When the lift is stationary or moving with constant velocity ; When the lift accelerates upwards with an acceleration a w = R = m(a+g) ;When the lift accelerates upwards with an acceleration a w = m(g-a) ;When the lift moves downwards with an acceleration a
w = mg = (g-a) ; When the lift moves downwards with an acceleration a
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Expansion of liquids |
v2 - v1 / v1(Φ2-Φ1)
Real expansivity = apparent expansivity + cubic expansivity
r=a+c
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Volumetric expansivity |
§ = v2 - v1 / v1(Φ1-Φ2)
v2 = v1 (1+§Φ)
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Determination of relative density of liquid using u-tube |
Height of water column / height of liquid column |
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Mechanical Advantage |
MA = Load / Effort |
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Velocity Ratio |
V.R = 1/sinΦ Length / height |
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Efficiency |
M.A / V.R x 100% Work output / work input x 100% Work output / work input = load x distance moved my L / effort x distance moved my E |
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V.R of a screw |
2πa/p |
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Conversion from Celsius to Fahrenheit |
C/100 = F-32 / 180 |
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Conversion from Celsius to Kelvin |
C / 100 = K-273 / 100 |
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Specific heat capacity of a material |
H = mc Q = mc (Φ2 - Φ1) where Q = quantity of heat
C = Q/ m(Φ2 - Φ1) |
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Latent heat |
L = quantity of heat / mass of substance Q = m x l |
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Measurement of heat loss of a solid by method of mixture |
Heat loss = heat gained by water and calorimeter |
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Determination of specific heat capacity by electronic method |
C = IVt / m(Φ2-Φ1) |
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Determination of specific capacity of liquid by electrical method |
IVt - McCc(Φ2-Φ1) / m1 (Φ2-Φ1) |
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Relative humidity |
Svp of Water at DEw point / Svp of water at original temperature |
