// //]]>
##### Get a free home demo of LearnNext

Available for CBSE, ICSE and State Board syllabus.
Call our LearnNext Expert on 1800 419 1234 (tollfree)
OR submit details below for a call back

clear

Next time you have a doubt while studying, you know where to go. By simply posting your questions on Question & Answer Forum, you can have them answered by academic experts. You can also find related videos and explanations for better understanding.

Hari answered 4 year(s) , 3 month(s) ago

A bullet of mass 10g travelling horizontally with a velocity of 150 m/s strikes a stationary wooden block and comes to rest in 0.03 sec. Calculate the distance of penetration of the bullet into the

Data:
mass of the bullet (m) = 10 g = (10/1000) kg =0.01 kg
Initial velocity (u) = 150 m/s
Final velocity (v) = 0 m/s
Time taken (t) = 0.03 sec

i. Calcul...

Aug 31

• 10 Likes
• 37564 Views

Aug 31

Explain, why some leaves of tree may get detached from a tree, if we vigorously shake its branch.

Leaves of tree may get detached from a tree, if we vigorously shake its branch due to inertia of rest. Leaves are in the state of rest with respect to the tree so they possess inertia of...

Apr 18

• 1 Like
• 26262 Views

Apr 18

Amarnathreddy answered 5 year(s) , 1 month(s) ago

1 Which of the following has more inertia : (a) A rubber ball and a stone of the same size? (b) A bicycle and a train? (c) A five rupees coin and one rupee coin?

Which of the following has more inertia?
(a) A rubber ball and a stone of the same size?
(b) A bicycle and a train?
(c) A...

Apr 18

• 0 Like
• 18455 Views

Apr 18

Amarnathreddy answered 5 year(s) , 10 month(s) ago

Derivation of Newton's second law of motion?

Suppose an object of mass, m is moving along a straight line with an initial velocity, u.
It is uniformly accelerated to velocity, v in time, t by the application of a constant force, F
throughout...

Aug 16

• 3 Likes
• 18105 Views

Aug 16

Amarnathreddy answered 5 year(s) , 9 month(s) ago

Derivation of law of conservation of momentum.

Sep 7

• 1 Like
• 17318 Views

Sep 7

Why does an athlete run some distance before taking a jump. State the law behind it.

Why does an athlete run some distance before taking a jump. Answer: An athlete runs before jumping to gain momentum. Because it helps in jumping higher and longer because of i...

Sep 3

• 1 Like
• 16895 Views

Sep 3

Amarnathreddy answered 4 year(s) , 10 month(s) ago

Derivation of Newton's first law from Neton's second law

Jul 30

• 2 Likes
• 16877 Views

Jul 30

Amarnathreddy answered 5 year(s) , 9 month(s) ago

if action is always equal to the reaction then how a horse is able to move a cart

Statement:  Newton’s third law of motion states that when one object exerts a force on another object, the second object i...

Sep 17

• 3 Likes
• 16427 Views

Sep 17

Janhavi answered 3 year(s) , 9 month(s) ago

Why is it advised to tie any luggage kept on a roof of a bus with a slope?

When the bus stops suddenly, the luggage on the roof top will fall forward due to inertia of motion. Similarly when the bus starts the luggage will fall backwards due to inertia of rest. To avoid this, any lugg...

Aug 18

• 1 Like
• 14147 Views

Aug 18

Amarnathreddy answered 5 year(s) , 9 month(s) ago

A 1000kg vehicle moving with a speed of 20m/s is brought to rest in a distance of 50meters find accelearation.calculate the unbalanced force acting on vehicle.

Data:  mass of the body = 1,000 kg
Initial velocity (u) = 20 m/s
Final velocity (v) = 0 m/s
Displacement (S) = 50 m
...

Aug 25

• 1 Like
• 11305 Views

Aug 25

Sagar answered 5 year(s) , 1 month(s) ago

Why do you fall in forward direction, when a moving bus brakes to a stop and fall backwards, when it accelerates from rest?

Every person has some mass and due to that, he/she has some inertia,when we're travelling in a car or a bus we have some momentum because of our mass and the velocity at which the bus is travelling and when it...

Apr 18

• 2 Likes
• 10785 Views

Apr 18

Amarnathreddy answered 5 year(s) , 7 month(s) ago

What is inertia, inertia of motion, inertiadirection, inertiarest? give an example for each.

1. Inertia of motion means the tendency of a body due to which it remains in motion.
• Example :- When we switch off a rotating fan it rotates until its speed is decreased to z
...

Sep 4

• 3 Likes
• 10411 Views

Sep 4

Agam answered 1 year(s) , 7 month(s) ago

Newton's all 3 laws with full variation, mathematical expression, derivation, alll

I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

II. The relationship between an object...

Feb 1

• 1 Like
• 10199 Views

Feb 1

Why do we fall forward when a moving bus stopped suddenly?

when a bus move s our lower portion of the body,i.e., the legs go in motion along with the bus as  it is in direct contact with the floor of the bus. And simultaneously, our upper body also comes in motion grad...

Mar 27

• 0 Like
• 9751 Views

Mar 27

State the meaning of recoil velocity of a gun ?

A gun fires a bullet with an action force due to which the bullet ejects forward with a certain velocity.In accordance to 3rd law of motion every action has an equal and opposite rea...

Sep 30

• 1 Like
• 8914 Views

Sep 30

Do action and reaction act on the same body or different bodies?

Action and reaction act on different bodies. For example when we push a wall with our hand, the reaction of the wall is on our hand whereas action done by us is on the wall.

May 27

• 1 Like
• 8469 Views

May 27

Amarnathreddy answered 4 year(s) , 8 month(s) ago

An object of mass 2 kg is sliding with a velocity 4m/s along the surface of a vertical wall.What is the force required to keep the object m..

An object of mass 2 kg is sliding with a velocity 4m/s along the surface of a vertical wall. What is the force required to keep the object moving with same velocity

A...

Sep 18

• 1 Like
• 7779 Views

Sep 18

Amarnathreddy answered 5 year(s) , 8 month(s) ago

China wares are wrapped in straw paper before packing give reason

China wares are wrapped in straw paper before packing give reason

Answer:  As a certain impulse applied for a short time will give a large force so...

Sep 26

• 2 Likes
• 7502 Views

Sep 26

Why is it difficult to walk on sand?

When we walk on the sand we push the sand with our feet but the sand yields, i.e., it does not react back with the same force. That is why it is difficult to walk on sand.

May 27

• 1 Like
• 7360 Views

May 27

Can force change the shape of an object? Give an example to prove your point?

Yes, we can change the shape of a balloon by applying force on it.

May 20

• 0 Like
• 7218 Views

May 20

###### Like NextGurukul? Also explore our advanced self-learning solution LearnNext
Offered for classes 6-12, LearnNext is a popular self-learning solution for students who strive for excellence
Explore
Animated Video
lessons
All India
Test Series
Interactive Video
Experiments
Best-in class
books