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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. ...
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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 ...
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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...
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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...
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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...
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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. ...
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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....
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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, ...
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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...
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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...
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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...
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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  ...
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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...
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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, ...
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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...
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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...
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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...
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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 ...
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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...
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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 ...
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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  ...
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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)  ...
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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...
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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...
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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...
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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...
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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...
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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....
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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,...
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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 ...
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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,...
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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...
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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 ...
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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...
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