S.I. Units
1. Mass.
it's amount of matter contained in a very body.
Unit of mass is metric weight unit (kg). alternative multiples normally used area unit :
one quintal = a hundred kilogram, one metric ton = ten quintals = one thousand kilogram
2. Force.
Unit of force is newton (N).
Its definition could also be obtained from Newton’s Second Law of Motion i.e
. F = ma. If m = one kilogram ; a = 1m/s2, then F = one newton.
Hence, one newton is that force which might provide associate acceleration of one m/s2 to a mass of one kilogram. attractive force unit of force is kilogram-weight (kg-wt). it should be outlined as follows :
or
it's the force which might impart associate acceleration of nine.8 m/s2 to a mass of one kilogram.
It is the force which might impart associate acceleration of one m/s2 to a mass of nine.8 kg.
Obviously, 1 kg-wt. = 9.8 N
3. Weight.
it's the force with that earth pulls a body downward. Obviously, its units area unit a similar as for force.
(a) Unit of weight is newton (N)
(b) attractive force unit of weight is kg-wt.
* Note. If a body includes a mass of m kilogram, then its weight, W = mg newtons = nine.8 newtons.
4. Work,
If a force F moves a body through a distance S in its direction of application, then
Work done W = F × S
(a) Unit of labor is joule (J).
If, within the on top of equation, F = one N : S = one m ; then work done = one m.N or joule.
Hence, one joule is that the work done once a force of one N moves a body through a distance of one m within the direction of its application.
(b) attractive force unit of labor is m-kg. wt or m-kg**.
If F = 1 kg-wt; S = 1 m; then W.D. = 1 m-kg. Wt = 1 m-kg.
Hence, one m-kg is the work done by a force of one kg-wt when applied over a distance of one metre. Obviously, 1 m-kg = 9.8 m-N or J.
5. Power.
it's the speed of doing work. Its units is watt (W) that represents one joule per second.
one W = one J/s
If a force of F newton moves a body with a rate of ν m./s then
power = F × ν watt
If the rate ν is in km/s, then
power = F × ν power unit
6. Kilowatt-hour (kWh) and kilocalorie (kcal)
1 kWh = 1000 × J1/ s × 3600 s = 36 × 10^5 J
1 kcal = 4,186 J ∴ 1 kWh = 36 × 10^5/4, 186 = 860 kcal
7. Miscellaneous Units
(i) 1 watt hour (Wh) = J1/ s × 3600 s = 3600 J
(ii) 1 horse power (metric) = 75 m-kg/s = 75 × 9.8 = 735.5 J/s or watt
(iii) 1 kilowatt (kW) = 1000 W and 1 megawatt (MW) = 106 W
1. Mass.
it's amount of matter contained in a very body.
Unit of mass is metric weight unit (kg). alternative multiples normally used area unit :
one quintal = a hundred kilogram, one metric ton = ten quintals = one thousand kilogram
2. Force.
Unit of force is newton (N).
Its definition could also be obtained from Newton’s Second Law of Motion i.e
. F = ma. If m = one kilogram ; a = 1m/s2, then F = one newton.
Hence, one newton is that force which might provide associate acceleration of one m/s2 to a mass of one kilogram. attractive force unit of force is kilogram-weight (kg-wt). it should be outlined as follows :
or
it's the force which might impart associate acceleration of nine.8 m/s2 to a mass of one kilogram.
It is the force which might impart associate acceleration of one m/s2 to a mass of nine.8 kg.
Obviously, 1 kg-wt. = 9.8 N
3. Weight.
it's the force with that earth pulls a body downward. Obviously, its units area unit a similar as for force.
(a) Unit of weight is newton (N)
(b) attractive force unit of weight is kg-wt.
* Note. If a body includes a mass of m kilogram, then its weight, W = mg newtons = nine.8 newtons.
4. Work,
If a force F moves a body through a distance S in its direction of application, then
Work done W = F × S
(a) Unit of labor is joule (J).
If, within the on top of equation, F = one N : S = one m ; then work done = one m.N or joule.
Hence, one joule is that the work done once a force of one N moves a body through a distance of one m within the direction of its application.
(b) attractive force unit of labor is m-kg. wt or m-kg**.
If F = 1 kg-wt; S = 1 m; then W.D. = 1 m-kg. Wt = 1 m-kg.
Hence, one m-kg is the work done by a force of one kg-wt when applied over a distance of one metre. Obviously, 1 m-kg = 9.8 m-N or J.
5. Power.
it's the speed of doing work. Its units is watt (W) that represents one joule per second.
one W = one J/s
If a force of F newton moves a body with a rate of ν m./s then
power = F × ν watt
If the rate ν is in km/s, then
power = F × ν power unit
6. Kilowatt-hour (kWh) and kilocalorie (kcal)
1 kWh = 1000 × J1/ s × 3600 s = 36 × 10^5 J
1 kcal = 4,186 J ∴ 1 kWh = 36 × 10^5/4, 186 = 860 kcal
7. Miscellaneous Units
(i) 1 watt hour (Wh) = J1/ s × 3600 s = 3600 J
(ii) 1 horse power (metric) = 75 m-kg/s = 75 × 9.8 = 735.5 J/s or watt
(iii) 1 kilowatt (kW) = 1000 W and 1 megawatt (MW) = 106 W
S.I. Units
Reviewed by I will write articles or blogs containing 500 words for you.....
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April 10, 2019
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Reviewed by I will write articles or blogs containing 500 words for you.....
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April 10, 2019
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