Question

what is force and the princpale of liver

Answer 1

Law of the lever. The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot. ... The use of velocity in the static analysis of a lever is an application of the principle of virtual work.

Answer 2

Heya!!!!

◆Answer:-

→Force Can Be Defined As A Push Or A Pull That Changes Or tends To Change The State Of Rest Or Uniform Motion Of An Object Or Changes The Direction Or Shape Of An Object.
They Can Be Due To Phenomena Such As Gravity, Magnetism, Or Anything That Might Cause A Mass To Accelerate.

There Are Different Types Of Forces In The Universe.Those Are:-

(1)Contact Forces

(2)Non-Contact Forces

(1)Contact Forces:-These Take Place When Objects Touch Each Other.

◆Types:-

1⃣ Tensional Force:-When A String / Thread / Wire Is Held Taut, The Ends Of The String Or Thread Pull On Whatever Bodies Are Attached To Them In The Direction Of The String. This is known as Tensional Force.

2⃣ Spring:-The ForceEexerted By A Compressed Or Stretched Spring Upon Any Object That Is Attached To It Is Known As Spring Force. An Object That Compresses Or Stretches A Spring Is Always Driven In The Direction That Restores The Object To Its Rest Or Equilibrium Position.

3⃣ Weight:-It Is A Field Force With Which A Body Is Pulled Towards The Center Of The Earth Due To Its Gravity. 
It Has The Magnitude 'mg', Where 'm' is the Mass Of The Body And 'g' Is The Acceleration Due To Gravity. 

4⃣ Air Resistance:-This Is A Special Type Of Friction That Acts Upon Objects As They Travel Through The Air. The Force Of Air Resistance Is Often Observed To Oppose The Motion Of An Object. It Is Most Noticeable For Objects That Travel At High Speeds Or For Objects With Large Surface Areas.

5⃣ Normal Reaction:-When A Body Exerts A Force On Another, The Second Provides A Reaction Which Acts Perpendicular To The Surface Of The Second Body. This Is Known As The Normal Reaction.

6⃣ Friction Force:-The Force Exerted By A Surface As An Object Moves Across It Or Makes An Effort To Move Across It Is Called Friction.
There Are At least Two Types Of Friction Force –
(i) Sliding
(ii) Static Friction

(2)Non-Contact Forces:-These Forces Take Place Due To Some Inherent Characteristics Of The Body And Come Into Existence Without Any Physical Interaction Between The Bodies.
In Short, Torces That Act Between Bodies Separated By A Distance Without Any Actual Contact

◆Types:-

1⃣ Gravitational Forces:-This Is Due To The Gravitational Attraction Between Two Bodies.
In The Case Of Attraction Due To Earth, The Force Is Always Directed Downwards.

2⃣ Electrical Forces:-These Are Due To The Charges Present On Two Bodies.
The Direction Of These Forces Depends On The Type of charges On The Two Interacting Bodies.

3⃣ Magnetic Force:-These Take Place Between Two Bodies Due To Their Magnetic Characteristics. The Direction Depends Upon The Nature Of Magnetic Polarity Acquired By The Bodies.

●Unit:-It Is Measured In ‘Newton’ (N). Newton Measures The Force Needed To Move, Accelerate Or Speed Up Objects.

The Basic Formula For it is, F = m.a, 【Where, ‘m’ Stands for the 'Mass In Kilograms' And ‘a’ Stands For Acceleration In m/sec^2. It May Also Be Measured In Pounds.

◇ Lever:- It Has Been Found By Experiment That Two Equal Forces Acting In Opposite Directions.Lever, Simple Machine Consisting Of A Rigid Bar That Rotates About A Fixed Point, Called A Fulcrum.

Levers reduce The Force Needed To Perform These Tasks. When Someone Uses A Lever, They Exert A Force Around A Pivot To Move An Object.

Hope It Helped (: