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This is done to decrease the speed of momentum

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which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.

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The third law of motion is every action has a equal and opposite reaction

For example if u throw a ball at a wall it comes back at u with equal force

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the impulsive force applied by the first object on the second one is equal and opposite to the impulsive force applied by the second object on the first object.This relation suggests that momentum is conserved during the collision.

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Newton’s third law- to every action there is an equal and opposite reaction
Ex- swimming, walking

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Initial momentum= mu
Final momentum= mv
Change in momentum= mv-mu
Rate of change of momentum= mv-mu/t = m(v-u)/t
acceleration= v-u/t (1st equation of motion)
Rate of change of momentum= ma
Force directly proportional to ma
F= ma

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Pushing a car
Hitting a ball

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1)karate kid breaking boards
2)Hitting a ball

Karate Player Breaking Slab of Bricks.

Karate Player Breaking Slab of Bricks.

Karate Player Breaking Slab of Bricks.

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TO every action is a equal and opposite recation eg.swimming,walking

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TO every action is a equal and opposite recation eg.swimming,walking

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p=m*v.
f is propotional to the     -change in momentum/time
force proportional to -mu-mv/t=m(v-u)/t =ma
force propotional to-ma= f=kma.    (k=1)
therefor F=ma

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Third law states that for every reaction there is a equal and opposite reaction .

When a sailor jumps out of the boat the boat moves backwards .

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To every action, there is an equal and opposite reaction.
Examples
1)a gun recoils when a bullet is fired from it.
2)swimming,walking etc.

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Initial momentum of A= m1u1
Initial momentum of B= m2u2
Total initial momentum (A+B)= m1u1+m2u2

Final momentum of A= m1v1
Final momentum of B= m2v2
Total final momentum= m1v1+m2v2

Rate of change of momentum of A= m1v1-m1u1/t

Rate of change of momentum of B= m2v2-m2u2/t

According to Newton's 3rd law
Action= - reaction
m1v1-m2u2/t = -(m2v2-m2u2/t)
m1v1- m1u1= -m2v2+m2u2
m1v1-+m2v2= m1u1+ m2u2

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The third law of motion states that for every action, there is an equal and opposite reaction. This can be observed both in objects at rest and those that are accelerating. For example, a resting box pushes down on the ground due to a gravitational force.

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* In cricket a fielder moves his arms backwards to take a catch
* Car passengers are advised to wear a seat belt

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This is done to prevent injury to the athlete when he falls down after making his/her jump.

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As it increase the time of fall of athlete and decreases the rate of change of momentum

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In a high jump athletic event ,athletes are made to fall either on a cushioned bed or on as and bed so as to increase the time of the athlete fall to stop after making the jump. This decreases the rate of change of momentum and hence the force.

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Eg: martiar breaks a pile of tilles or slab of ice in a  single blow

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Eg: martiar breaks a pile of tilles or slab of ice in a  single blow

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* to every action there is an eqalent opposite reaction
Examples: *A gun recoils when a bullet is fired

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So that it increases time and decrease the force

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Gun recoils when a bullet is fired
Swimming, walking etc..

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lets take object A  and object B. which had a collision between them
A=m1 ,u1,v1
B=m2 ,u2,v2
f1=-f2
m1(v1-u1)/t=-m2(v2-u2)/t    (cancellation of 't')
m1(v1-u1)= -m2(v2-u2)=m1u1+m2u2 =m1v1+m2v2