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The International System of Units (SI units)
The SI units has seven base units and all the other are derived from these seven base units and are called derived units
| Base Physical quantity | Symbol | SI units |
| Length | l | Meter (m) |
| Mass | m | Kilogram(kg) |
| Time | t | Sec(s) |
| Temperature | T | Kelvin(K) |
| Electric current | I | Ampere(A) |
| Amount of Substance | N | Mole(M) |
| Luminous intensity | Iv | Candela(cd) |
Speed, Volume, density can be derived from these base Units.Some Common Physical quantity and their derived units
| Physical Quantity | Symbol | Name | Unit |
| Mass | m , M | kilogram | kg |
| Linear position Length, Distance Radius |
x, r l, d R |
meter | m |
| Time | t, | second | s |
| Area | A | - | m2 |
| Volume | V | - | m3 |
| Density | - | kg/m3 | |
| Linear velocity | v, u, c | - | m/s |
| Linear momentum | p | - | kg*m/s |
| Linear acceleration | a | - | m/s2 |
| Force | F | newton | N=kg*m/s2 |
| Impulse | I | - | N*s |
| Work Energy |
W E |
joule | J=N*m |
| Power | P | watt | W=J/s |
SI Unit system allow the use of prefix to show multiples or sub multiple of units
| Prefixes in SI system Multiple | Prefix | Symbol |
| 10-12 | pico | p |
| 10-9 | nano | n |
| 10-6 | micro | μ |
| 10-3 | milli | m |
| 10-2 | centi | c |
| 10-1 | deci | d |
| 10 | deca | da |
| 102 | hecto | h |
| 103 | kilo | k |
| 106 | mega | M |
| 109 | giga | G |
| 1012 | tera | T |
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Yogita Ingle 4 years, 3 months ago
The SI unit of stress is Newton per square meter. Or we can express the same in terms of Pascal.
1 Pascal = 1 Pa = 1 N.m-2.
While there is no unit for strain. It is a dimensionless quantity. This is because it is the ratio of change of length to the original length, and therefore it is unitless.
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Yogita Ingle 4 years, 3 months ago
Two bodies of mass M and m are moving in opposite directions with the velocities v. If they collide and move together after the collision, we have to find the velocity of the system.
Since there is no external force acting on the system of two bodies, momentum will be conserved.
Initial momentum = Final momentum
(Mv – mv) = (M+m)VFinal
From this equation, we can easily find the final velocity of the system.
Posted by Aadya Singh 4 years, 3 months ago
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Yogita Ingle 4 years, 3 months ago
Let it will take T time to cover the whole length
so we can say
now in last 0.2 s it will cover 6 m
now by above two equations
now the height of the tree is
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The systematic observations, controlled experiments, qualitative reasoning, mathematical proofs and prediction is called scientific method.
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<a href="https://ibb.co/0ftZyZT">
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Yogita Ingle 4 years, 3 months ago
Lami’s Theorem states, “When three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two forces”. Referring to the above diagram, consider three forces A, B, C acting on a particle or rigid body making angles α, β and γ with each other.
In the mathematical or equation form, it is expressed as,
{tex}\frac{A}{sin\alpha} = \frac{B}{sin\beta} = \frac{C}{sin\gamma}{/tex}
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Jagdish 4 years, 3 months ago
1Thank You