Second law of motion with Example and daigram in 9th class
Answers
Answered by
0
hey dear ^^_^^
Answer is here.....
NEWTON'S SECOND LAW OF MOTION :
According to this law, the change in momentum of a body per unit time (i.e, rate of change of momentum) is directly proportional to the unbalanced force acting on the body and the change in momentum takes place in the direction of the unbalanced force on the body.
i.e, F ∝ dp/dt
where, dp = change in momentum
dt = Time taken for this change in
momentum.
The second law is expressed as an equation:-
F net = m.a
Where, F net → is the net force acting on the object
and is measured in Newton's (N).
m → is the mass of the object and is
measured in kilograms (Kg).
a → is the acceleration of the object
and is measured in metre per
second square (m/s²).
Some Applications :-
---------------------------
1.) A cricket player lowers his hands while catching the ball.
→ If a player does not lower his hands while catching the ball, the time to stop the ball is very small . So, a large force has to be applied to reduce the velocity of the ball to zero or to change the momentum of the ball. when a player lowers his hands, the time taken to stop the ball is increased
and hence, less force has to be applied to cause the same change in the momentum of the ball.
Therefore, the hands of the player are not injured.
----------------------------
2.) A Boxer moves his head back ward when his opponent blows a punch .
→ When one boxer blows a punch on the face of another player, then the change in momentum of the punch on striking the face of another player exerts a large force on his face.
On the other hand, when the boxer moves his head back ward, then the change in momentum of the punch of the opponent player takes place in a large interval of time.
Hence, the impact of the punch (i.e , force) on the face of the boxer is very less .
-----------------------------
3.) A karate player breaks the piles of tiles or bricks with a single blow.
→ When a karate player strikes the piles of tiles with his hands, he does so as fast as possible, In other words, the time taken to strike the piles of tiles is very small.
As the momentum of the hand of a karate player reduces to zero when his hands strikes the piles of tiles in very- very small interval of time, therefore, a very large force is exerted on the pile of tiles.
This force is enough to break the pile of tiles.
→→→→→→→→→→→→→→→→→→→→→→→→
hope its help uh
→→→→→→→→→→→→→→→→→→→→→→→→→
Answer is here.....
NEWTON'S SECOND LAW OF MOTION :
According to this law, the change in momentum of a body per unit time (i.e, rate of change of momentum) is directly proportional to the unbalanced force acting on the body and the change in momentum takes place in the direction of the unbalanced force on the body.
i.e, F ∝ dp/dt
where, dp = change in momentum
dt = Time taken for this change in
momentum.
The second law is expressed as an equation:-
F net = m.a
Where, F net → is the net force acting on the object
and is measured in Newton's (N).
m → is the mass of the object and is
measured in kilograms (Kg).
a → is the acceleration of the object
and is measured in metre per
second square (m/s²).
Some Applications :-
---------------------------
1.) A cricket player lowers his hands while catching the ball.
→ If a player does not lower his hands while catching the ball, the time to stop the ball is very small . So, a large force has to be applied to reduce the velocity of the ball to zero or to change the momentum of the ball. when a player lowers his hands, the time taken to stop the ball is increased
and hence, less force has to be applied to cause the same change in the momentum of the ball.
Therefore, the hands of the player are not injured.
----------------------------
2.) A Boxer moves his head back ward when his opponent blows a punch .
→ When one boxer blows a punch on the face of another player, then the change in momentum of the punch on striking the face of another player exerts a large force on his face.
On the other hand, when the boxer moves his head back ward, then the change in momentum of the punch of the opponent player takes place in a large interval of time.
Hence, the impact of the punch (i.e , force) on the face of the boxer is very less .
-----------------------------
3.) A karate player breaks the piles of tiles or bricks with a single blow.
→ When a karate player strikes the piles of tiles with his hands, he does so as fast as possible, In other words, the time taken to strike the piles of tiles is very small.
As the momentum of the hand of a karate player reduces to zero when his hands strikes the piles of tiles in very- very small interval of time, therefore, a very large force is exerted on the pile of tiles.
This force is enough to break the pile of tiles.
→→→→→→→→→→→→→→→→→→→→→→→→
hope its help uh
→→→→→→→→→→→→→→→→→→→→→→→→→
Attachments:
Answered by
0
The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force
Similar questions