Question 1 :
A box has to be moved from point A to point B. Which is the easiest way to move it?

Question 2 :
In a rotor, a hollow vertical cylindrical structure rotates about its axis and a person rests against the inner wall. At a particular speed of the rotor, the floor below the person is removed and the person hangs resting against the wall without any floor. If the radius of the rotor is 2 m and the coefficient of static friction between the wall and the person is 0.2, find the minimum speed at which the floor may be removed. ( Take g =10 $m/s^{2}$)

Question 4 :
A balloon has 5 g of air. A small hole is pierced into it. The air escapes at a uniform rate with a velocity of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917aee313cbb7c3feadf0b">. If the balloon shrinks completely in 2.5 s the average force acting on the balloon is

Question 6 :
A body of mass 10 kg slides along a rough horizontal surface. The coefficient of friction is l/√3. Taking g = 10 m/s², the least force which acts at an angle of 30° to the horizontal is

Question 7 :
A man of mass $80$ kg pushes a box of mass $20$ kg horizontally. The man moves the box with a constant acceleration of $2 m/s^2$ but his foot does not slip on the ground. There is no friction between the box and the ground, whereas there is sufficient friction between the man's foot and the ground to prevent him from slipping.<br/>Statement-1: The force applied by the man on the box is equal and opposite to the force applied by the box on&#160;the man.<br/>and<br/>Statement-2: Friction force applied by the ground on the man is $200$ N.<br/>

Question 8 :
A body is moving along a rough horizontal surface with an initial velocity <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917a4167ed907b153d2ba2">. If the body comes to rest after travelling <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917a411a95347cde4a1116">, then the coefficient of sliding friction will be

Question 9 :
To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?<br>

Question 10 :
A cold soft drink is kept on the balance. When the cap is open, then the weight

Question 11 :
A spring balance and a physical balance are kept in a lift. In these balances equal masses are placed. If now the lift starts moving upwards with constant acceleration, then

Question 12 :
A marble block of mass $2kg$ lying on ice when given a velocity of $6m/s$ is stopped by friction in $10s$, then the coefficient of friction is (take g=$10 ms^{-2}$)

Question 13 :
A block of mass 4 kg is kept on a rough horizontal surface. The coefficient of static friction is 0.8. If a force of 19 N is applied on the block parallel to the floor, then the force of friction between the block and floor is

Question 15 :
An overweight acrobat, "weighing" in at {tex}115 \mathrm {kg}{/tex} , wants to perform a single hand stand. He tries to, cheat by resting one foot against a smooth frictionless vertical wall. The horizontal force ee there is {tex} 130 \mathrm { N } {/tex}. What is the magnitude of the force exerted by the floor on his hand? Answer in {tex} \mathrm { N } {/tex}.

Question 16 :
A pail filled with sand has a total mass of {tex} 60 \mathrm { kg } . \mathrm { A } {/tex} crane is lowering it such that it has an initial downward acceleration of {tex} 1.5 \mathrm { m } / \mathrm { s } ^ { 2 } . {/tex} A hole in the pail allows sand to leak out. If the force exerted by the crane on the pail does not change, what mass of sand must leak out before the downward acceleration decreases to zero?

Question 18 :
A body of mass 8 kg is suspended through two light springs <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e9177a41a95347cde4a0e9b"> and <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e9177a5313cbb7c3feadb7d"> connected in series as shown in figure. The reading is <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e9177a41a95347cde4a0e9b"> and <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e9177a5313cbb7c3feadb7d"> respectively are  </p> <img style='object-fit:contain' id="Picture 45" src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917b1f67ed907b153d2cdf" >

Question 19 :
A book of weight $20$ $N$ is pressed between two&#160;hands and each hand exerts a force of $40$ $N$. If&#160;the book just starts to slide down, then the coefficient&#160;of friction is

Question 20 :
If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that

Question 22 :
An ice cart of mass 60 kg rests on a horizontal snow patch with coefficient of static friction<img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917ad81a95347cde4a11ef">. Assuming that there is no vertical acceleration, find the magnitude of the maximum horizontal force required to move the ice cart <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917b3b313cbb7c3feadf82">

Question 23 :
A {tex} 600 \mathrm { kg } {/tex} rocket is set for a vertical firing. If the exhaust speed is {tex} 1000 \mathrm { ms } ^ { - 1 } , {/tex} the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is

Question 24 :
Assertion: In order to reduce sliding friction, lubricants are used. Reason: Lubrication changes the conditions of rubbing, replacing the sliding friction by rolling friction, thereby reducing the force of friction.

Question 25 :
A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls

Question 26 :
An unbanked curve has a radius of $60m$. The maximum speed at which a car can make a turn if the coefficient of static friction is $0.75$, is

Question 27 :
Four children were asked to arrange friction due to rolling, static and sliding in a decreasing order. Their arrangements are given below. Choose the correct arrangement.

Question 28 :
A block of mass $m$ is at rest on a rough inclined plane of angle of inclination $\theta$. If coefficient of friction between the block and the inclined plane is $\mu$, then the minimum value of force along the plane required to move the block on the plane is:

Question 29 :
If the normal force is doubled, the co-efficient of friction is?

Question 30 :
The arrow with a pointed tip can move faster in air than that of with a blunt tip.<br/>

Question 31 :
Choose the correct statements. The coefficient of static friction depends on<br/>(1) the material of the bodies in contact.<br/>(2) quality of machining of the surface in contact.<br/>(3) presence of foreign matter between the surface.<br/>(4) area of the surfaces in contact.

Question 32 :
A second’s pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket

Question 33 :
A bullet of mass 0.05 kg moving with a speed of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e917b61313cbb7c3feadfc4"> enters a wooden block and is stopped after a distance of 0.40 m. The average resistive force exerted by the block on the bullet is

Question 34 :
State whether the given statement is true or false:<div>Fluid friction is more than solid friction.</div>

Question 35 :
Which of the following is used to reduce friction :<br>1. Streamlines<br>2. Use of ball bearings<br>3. Lubrication

Question 36 :
Force of 4 N is applied on a body of mass 20 kg. The work done in 3rd second is

Question 37 :
A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

Question 38 :
A vessel containing water is given a constant acceleration <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e91777067ed907b153d28e2"> towards the right, along a straight horizontal path. Which of the following diagram represents the surface of the liquid</p> <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e91783f313cbb7c3feadc24">

Question 40 :
Match the following<br/><table class="wysiwyg-table"><tbody><tr><td></td><td>List I</td><td></td><td>List II</td></tr><tr><td>1</td><td>Streamlined body structure</td><td>a</td><td>Less no. of irregularities</td></tr><tr><td>2</td><td>Pressing two objects harder against each other</td><td>b</td><td>Lubricant</td></tr><tr><td>3</td><td>Grease</td><td>c</td><td>Increase friction</td></tr><tr><td>4</td><td>Smooth surface</td><td>d</td><td>Decrease friction</td></tr></tbody></table>

Question 41 :
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may<br>

Question 42 :
You are marooned on a frictionless horizontal surface and cannot exert any horizontal force by pushing against the surface. How can you get off ?

Question 43 :
A car has to move on a level turn of radius $45m$. If the coefficient of static friction between the tyre and the road is $\mu_s = 2.0$, find the maximum speed the car can take without skidding.

Question 44 :
A horizontal uniform rope of length {tex} L , {/tex} resting on a frictionless horizontal surface, is pulled at one end by force {tex} F . {/tex} What is the tension in the rope at a distance {tex} l {/tex} from the end where the force is applied?

Question 45 :
On a railway curve the outside rail is laid higher than the inside one so that resultant force exerted on the wheels of the rail car by the tops of the rails will