Question 1 :
Force of 4 N is applied on a body of mass 20 kg. The work done in 3rd second is

Question 2 :
A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. If a force of 2.8 N is applied on the block parallel to floor, the force of friction between the block and floor (Taking <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e91774e67ed907b153d28bb">) is

Question 5 :
A boy, sitting on the topmost birth in the compartment of a train which is just going to stop on the railway station, drops an apple aiming at the open hand of his brother situated vertically below his own hand at a distance of {tex} 2 \mathrm { m } . {/tex} The apple will fall

Question 6 :
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 7 :
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 8 :
For which type of surface magnitude of frictional force would be less?<br>

Question 9 :
State if the following statements are true or false. Correct the statement if it is false.<br>Tyres of vehicles are provided with grooved designs to decrease friction.

Question 10 :
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 11 :
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 12 :
A system shown in the figure. Assume that cylinder remains in contact with the wedge and block hence the velocity of cylinder is<br> <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/NEET/5e105215ed6e36502132f889' />

Question 14 :
A box has to be moved from point A to point B. Which is the easiest way to move it?

Question 15 :
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 16 :
A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

Question 17 :
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

Question 18 :
A train is moving with velocity 20 m/s on this dust is falling at the rate 50kg/min. The extra force requested to move this train with a constant velocity will be

Question 20 :
A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls

Question 21 :
A truck is carry a box of mass $m = 50 \,kg$ on its flat horizontal rough surface with coefficient of friction $p = 0.3$. It is crossing a circular track of radius $27 \,m$. What is the maximum speed of the truck to that the box does not slide from the muck while moving on the circular path?

Question 22 :
A closed compartment containing gas is moving with some acceleration in horizontal direction. Neglect effect of gravity. Then the pressure in the compartment is

Question 23 :
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 25 :
Assertion: We can live very happily if the friction is not present in nature. Reason: Aeroplane shape is stream lined to reduce the effort of frictional force.