ETHIO PHYSICS

2023-02-20 13:42:49 Buka / Bagaimana

2023-02-18 14:27:22 Entrance 2014, All Natural Subjects Buka / Bagaimana

2023-02-06 09:38:27 FRICTION
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2023-02-05 11:41:13 Equillibrium of concurrent forces

The line of action of concurrent forces passes through a single point.
When they are in equillibrium, sumF = 0
Therefore
sumFx =0 ; sumFy = 0; sumFz = 0
When two Forces are in equillibrium,
F1 + F2 =0, then F1 =- F2
When three forces are in equillibrium, F
F1+ F2 + F3 =0
F1+ F2= - F3
When three vectors of forces are arranged head to tail and formed regular triangle, then the relation is obtained as below:
F1/sina = F2/sinB = F3/sinY
Where a is alpha , B is beta and Y is gama.

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2023-02-03 11:27:01 Momentum:
Product of mass (m) and velocity (v) is called momentum ( p). p = mv
Mometum gives more information than velocity
SI unit: kgms or Ns
Dimensional fomula: M'L'TH


Law of Conservation of momentum :

"Total momentum of Isolated system remains constant."
If the resultant external force acting on a system F=0 then, Total momentum of system P = Constant
Momentum of the system can individually change, but their vector addition (total momentum) remains constant.
Resultant acceleration of the system  a=0
velocty of the system constant
path of motion of a body does not change.

Law of conservation of momentum is fundamental and universal. Buka / Bagaimana

2021-02-28 12:08:52 Force

When two bodies interact with each other, forces are produced between them.

Force is a push or a pull exerted between bodies.

Force has magnitude and direction.

It is measured by a Newton meter.

Forces are classified as contact and non- contact forces

Newton's Law

Newton’s first law of motion states that a body at rest remains at rest or a body moving with a uniform velocity continues to move at that velocity, unless an external force is applied.

The states of no motion and uniform motion remain the same in the absence of a force.

Uniform Motion

Uniform motion in a straight line is illustrated with a constant velocity. The s against t graph uniform motion is a straight line graph.
The slope of the S against t graph equals the velocity.

Uniform Accelerated Motion

Uniformly accelerated motion in a straight line is illustrated with a changing velocity.
The v against t graph for an accelerated motion is a straight line.

The slope of the v against t graph equals the acceleration.

The area of the v against t graph equals the distance traveled for the time ‘t’.

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2021-02-06 20:23:57 Ratio is a comparision of two or more quantities (magnitudes) of the same kind, in the same unit.

Note:
. The ratio of one quantity a to another quantity b is usually denoted by a:b or a/b but b is not equal to Zero.

. a and b are called terms of the ratio.
.The first number a is called antecedent and the second number b is called consequent.
. The ratio of a to b is written as any one of the following forms:

a:b (read as “the ratio of a to b or simply a is to b”).

.a/b is (read as a over b )
a ÷ b (read as a divided by b provide b ≠ 0).

. While comparing two quantities interms of ratio, one must bear in mind the following:
.The two quantities must be the same kind.
.For any two quantities a and b a:b ≠ b:a.
.Ratio have no unit (it is simply a number).
.The units of measurement of the two quantities must be the same.
.In most cases the ratio a:b is written in simplified form where a and b are natural numbers.

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2021-02-02 21:03:04 How to add fractions easily Buka / Bagaimana

2021-01-30 08:54:23 Buka / Bagaimana