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NEET - Grade 11 - Physics - Laws of Motion - Importance and Snapshot of Laws of Motion - Study ref# 692

Introduction: We saw that uniform motion needs the concept of velocity alone whereas non-uniform motion requires the concept of acceleration in addition. So far, we have not asked the question as to what governs the motion of bodies. ... read more

NEET - Grade 11 - Physics - Laws of Motion - Importance and Snapshot of Laws of Motion - Study ref# 693

Following sections must be covered to understand Laws of Motion: 1. Introduction 2. Aristotle’s fallacy. 3. The law of inertia. 4. Newton’s first law of motion. 5. Newton’s second law of motion. 6.  Newton’s third law of ... read more

NEET - Grade 11 - Physics - Gravitation - Importance and Snapshot of Gravitation - Study ref# 712

Introduction: Early in our lives, we become aware of tendency of all material objects to be attracted towards the earth, going uphill is lot more tiring than going downhill and there are many other such phenomena. Historically it was t... read more

NEET - Grade 12 - Physics - Current Electricity - Introduction and Snapshot of Current Electricity - Study ref# 812

Introduction: In Chapter 1, all charges whether free or bound, were considered to be at rest. Charges in motion constitute an electric current. Such currents occur naturally in many situations. Lightning is one such phenomenon in which... read more

NEET - Grade 11 - Physics - Laws of Motion - Target Setup for Laws of Motion - Study ref# 706

Student requires to achieve the following milestones to get better grip over Laws of Motion. The milestones / targets are as follows:- Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Test000... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 232

State Impulse - momentum theorem. Answer: The change in momentum associated with a body can be produced by a large force for small time or a small force for large time.                      ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 233

The distance travelled by a moving body is directly proportional to . Draw the force vs time graph. Answer: Given that, Or, Or, Where, m is the mass or the moving body.... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 234

Show that if the force acting on a particle is zero, its momentum will remain unchanged. Answer: According to Newton’s second law of motion,When F = 0, ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 235

If the speed of a motor car is doubled, how much more distance will it cover before stopping under the same retarding force? Answer: As Now, i.e, distance covered by motor car will becomes 4 times. The car will cover three times more distan... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 236

Two bodies of mass M and m are allowed to fall from the same height. If air resistance for each body be same, will the two bodies reach the ground simultaneously? Answer: No, the heavier body will reach the ground earlier. Because net downward f... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 237

A bird sitting on the floor of a closed glass cage and the cage is in the hand of a girl. Does the girl feel any change in the weight of the cage when the bird (i) starts flying in the cage with a constant velocity (ii) flies upward with acceleration... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 238

When a wheel is rolling on a level road, what is the direction of frictional force on the wheel due to the road? Answer: As the wheel is moving forward, the portion of the wheel in contact with the road moves backward. Hence, the force of friction mu... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 239

A block of mass 2 kg lies on horizontal surface of the truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the block is 5 m/s2, calculate the frictional force acting on the block. Answer: Limitin... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 240

Why has a horse to pull a cart harder during the first few steps of his motion? Answer: During the first few steps of his motion, the horse has to pull a cart harder, because the horse has to do work against the limiting friction. Once the motion sta... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 241

What is the angle of friction between two surfaces in contact, if coefficient of static friction is  and coefficient of kinetic friction is ? Answer: Given that From the definition of angle of  friction    ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 242

The speed of a moving car safely in darkness depends upon the range of headlights, explain. Answer: The range of headlights of car is the maximum distance(s), upto which an obstacle on the road can be seen by the driver. The car must stop before it h... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 243

A force of 10 N changes the velocity of a body from 10 m/s to 20 m/s in 5 sec. how much force is required to bring same change in velocity in 2 sec? Answer: From Newton’s second law, Now,      ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 244

Three identical blocks, each having a mass M are pushed by a force F on a frictionless table as shown in figure.i) What is the acceleration of the blocks?ii) What is the net force on the block A?iii) What force does A apply on B?iv) What force does B... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 245

A body of mass m is suspended by strings making angles  with the horizontal as shown in figure. Find the tensions in the strings. Answer: From figure,       ------- (i)Again, vertical components of  b... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 246

The pulley arrangements of figure are identical. The mass of the rope is negligible. In (i), the mass m is lifted up by attaching a mass 2m to the other end of the rope. In (ii) m is lifted up by pulling the other end of the rope with a constant down... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 247

The force on a particle of mass 10 gm is . If it starts from rest, what would be its position at time t = 5 s? Answer: Here, force  Acceleration a = Position at time t = 5 sec is   ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 248

Define (i) angle of friction (ii) coefficient of friction and (iii) angle of repose. Establish a relation between them. Answer: (i) Angle of friction: The angle of friction between any two surfaces in contact is defined as the angle whic... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 249

Calculate the amount of work done in moving a body up a rough inclined plane. Answer: Suppose m is the mass of a body that has to be moved up a rough plane AB, inclined to the horizontal at an angle .The various forces involved are:i) Weight ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 250

Find the angle through which a cyclist bends when he covers a circular path 34.3 m long in  Answer: If r is the radius of the circular path, then length of the path is time taken t = Now, for bending of a cyclist    ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 251

In the arrangement shown in figure, show that tension in the string between masses  and  is . Answer: The equation of motion for the three blocks are:    -------- (i)    -------(ii)  ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 252

Discuss the bending of a cyclist while describing a curved path. Find the relation for angle of bending of the cyclist. Answer: When a cyclist takes a turn, he also requires some centripetal force. To calculate the angle of bending with vertical, sup... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 253

Derive an expression for acceleration of a body down a rough inclined plane. Answer: When a plane is inclined to the horizontal at an angle , which is greater than the angle of repose, the body placed on the inclined plane slides down with an ac... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 254

A body of mass m is released from the top of a rough inclined plane of length l and height h. if f is the force of friction prove that the body will reach the bottom with a velocity  Answer: When the body moves down the inclined planeThe acceler... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 255

State the laws of limiting friction. Answer: Laws of friction:a. The magnitude of the force of friction between the surfaces of two bodies in contact is directly proportional to the normal reaction (N) between them i.e,    &nbs... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 256

State and prove the principle of conservation of linear momentum. Answer: It states that “The total momentum of an isolated system (i.e. a system of no external force) of interacting particles is conserved”.   Consider two bodies A and B, w... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 257

What do you understand by concurrent forces? State the conditions for the equilibrium of a particle under the effect of concurrent forces. Answer: Concurrent forces: The forces which are acting at the same point are called concurrent forces.... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 258

A bullet of mass 7 gm is fired into a block of metal weighing 7 kg. The block is free to move. Calculate initial velocity of the bullet if the velocity of the block with the bullet is 0.7 m/s. Answer: According to the conservation of linear momentum,... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 259

A block slides down an incline of angle  with an acceleration . Find the coefficient of kinetic friction. Answer: As the block is sliding down with And normal reaction is So, coefficient of kinetic friction is ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 260

A ball of mass 0.1 kg is suspended by a string of length 30 cm. keeping the string always tight, the ball describes a horizontal circle of radius 15 cm. calculate the angular speed of the ball. Answer: Here, m = 0.1 kg,   l = 30 cm = 0.3 m,... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 261

A ball of mass m hits a wall at an angle  with a velocity 15 m/s. If the ball rebounds at  to the direction of incidence, calculate the impulse received by the ball. Answer: Initial momentum of the ball isAnd final momentum of the... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 262

Why are the curved roads banked? Obtain an expression for angle of banking of a road. Answer: The maximum permissible velocity with which a vehicle can go round a curved road without skidding depends on , the coefficient of friction between the ... read more

NEET - Grade 11 - Physics - Laws of Motion - Study ref# 263

Explain that static friction is self-adjusting force. Answer: Neither the magnitude nor the direction of the force of static friction is fixed. Both these things adjust themselves according to the applied force. We know that unless the block starts m... read more

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