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Impulse is

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Important Questions on Force

EASY
An object of mass 2 kg moving under the action of a force which varies with time as shown in the figure.
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Which one of the following statements is correct for the interval from 0 to 20 s?
EASY
A small block of material having relative density 13 is immersed in a liquid and released. The block starts moving upwards with an acceleration a. The value of a is :(g is the acceleration due to gravity)
EASY
Among the following, the body possessing highest momentum is :
EASY
An object of mass 10 gm is moving with an acceleration of 10 m/s2. Force acting on the object will be:
MEDIUM
Figure shows the velocity versus time graph for a block of mass 50 g sliding on a rough floor. The average rate at which energy dissipates (in Js-1) due to the force of friction is:  
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EASY

The variation in momentum with time, for a body under collision is shown in figure. The maximum & minimum instantaneous forces are respectively on these points:

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EASY

In a two body collision, the momentum is varying with time as shown in graph. The instantaneous force is maximum at: 

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MEDIUM

The velocity-time graph of a ball of mass 20 g moving along a straight line on a long table is given in figure.The force exerted by the table on the ball to bring it to rest is :

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EASY
Unit of momentum is :
EASY
What is the SI unit of momentum?
EASY
A machine gun fires a bullet of mass 40 gram at a speed of 1200 m s-1. The man holding it can exert a maximum force of 144 N on the gun. How many bullets can he fire per second at the most?
MEDIUM
A particle having a mass 0.5 kg is projected under gravity with a speed of 98 m sec-1 at an angle of 60°.  The magnitude of the change in momentum (in N sec) of the particle after 10 seconds is g=9.8 m s-2
MEDIUM

A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. The catching process is completed in 0.1 second. The force exerted by the ball on the hand of the player is

EASY

A force ‘F’ is applied on one end of a rope of length ‘a’. P and Q are two points of length ‘b’ from nearest end. The ratio of tensions in string at P & Q is :

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MEDIUM
Two objects have masses in the ratio 1:2. If the forces acting on them are in the ratio 2:1 then the ratio of their acceleration is
MEDIUM
A diwali rocket is ejecting 0.05kg of gases per second at a velocity of 400 m s-1. The accelerating force on the rocket is
EASY

Read the following statements and choose the correct option:
Statement: Newton's second law of motion gives the measurement of force. 
Reason: According to Newton's second law of motion, force is directly proportional to the rate of change of momentum. 

MEDIUM

A dynamometer D is attached to two masses m1=3 kg and m2=5 kg. Forces of f1=9 N and f2=25 N are applied to the masses as shown.

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The dynamometer will read :

EASY
Which is the unit of Force?
HARD
A solid horizontal surface is covered with a thin layer of oil. A rectangular block of mass m=0.4 kg is at rest on this surface. An impulse of 1.0 N s is applied to the block at time t=0 so that it starts moving along the x-axis with a velocity vt=v0e-tτ, where v0 is a constant and τ=4 s . The displacement of the block, in meter, at t=τ is __________. Take e-1=0.37.