Question 1 :
A body of mass $60 kg$ has the momentum $3000 kg m s^{-1}$. Calculate the speed of the body.
Question 2 : <div>A passenger in a train hangs a stone from a string and holds it vertically. It is observed that the string is vertical as seen from the man.</div><div>Which of the following could be true about the motion of the train?</div><div>I. The train is at rest.</div>II. The train is moving with a constant velocity.<br/>III. The train is increasing its speed.<br/>IV. The train is decreasing its speed.
Question 3 :
When a car accelerates rapidly forward, the heads of people in the car seem to jerk backward.<br>This is best explained by which of the following?
Question 4 :
A large force is acting on a body for a short time. The impulse imparted is equal to the change in :
Question 6 :
'The action and reaction both act simultaneously.' Is this statement true and what is the net force ?
Question 7 :
State if the following statements are true or false. Correct the statement if it is false.<br>Like charges always attract each other.
Question 8 :
The action and reaction force referred to in the third law
Question 9 :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same _____________.
Question 10 :
When a man pushes on his cart, the man moves because of:
Question 11 :
A man is stranded in the middle of a perfectly smooth island of ice, where there is no friction between the ground and his feet. Under these circumstances,
Question 15 :
A bird weight 2 kg and is inside a cage of 1kg. If it starts flying then the weight of the bird and cage assembly is
Question 16 :
The average force necessary to stop a hammer with 25 N-s momentum in 0.05s expressed in N is :<br/>
Question 18 :
It is difficult for a fireman to hold a hose pipe which ejects large amounts of water at high velocity due to :<br/>
Question 19 :
A body is lying on the surface of earth.Suppose that the earth suddenly loses its power of attraction, then:
Question 20 :
A metal ball does not rebound when struck on a wall, whereas a rubber ball of same mass when thrown with the same velocity on the wall rebounds. From this it is inferred that:
Question 21 :
What is the mass of an object whose weight is 980 N?
Question 23 :
Which of the following laws of motion is (are) involved in the motion of the rocket ?
Question 24 :
The force of gravity on a body of mass W on the surface of the earth is
Question 25 :
Assertion: The weight of an object changes from place to place but not mass.
Reason: The weight of the object is independent of the value of g
Question 26 :
A number of discs, each of momentum M kg m/s are striking a wall at the rate of n discs per minute. The force associated with these discs, in newtons, would be
Question 27 :
If $\displaystyle g=10{ ms }^{ -2 }$ what is the force of gravity acting on a mass of 1 kg?
Question 28 :
A man is standing on a platform of a balance and takes a quick step, then his weight:<br/>
Question 30 :
The change in momentum of a body per unit time represents
Question 31 :
A boy is carrying a bucket of water in one hand and a piece of plaster in the other. After transferring the plaster piece to the bucket (in which it floats) the body will carry
Question 32 :
A cricket ball of mass 150 g is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. The force of the blow acts for 0.001 & on the ball. Find that force?
Question 33 :
A $6.0 N$ horizontal force is applied to a flat rock on a friction less frozen pond, causing it to accelerate at $2.0 m/s^{2}$. What is the mass of the rock?
Question 34 :
A scooter of mass 120 kg is moving with a uniform velocity of 108 km h$^{-1}$. The force required to stop the vehicle in 0.1s is:<br/>
Question 36 :
Assertion: Newton's third law of motion is applicable only when bodies are in motion.
Reason: Newton's third law applies to all types of forces. e.g. gravitational, electric or magnetic forces etc.,
Question 37 :
The gravitational pull exerted by the earth on a body is called its:
Question 38 :
If a spring balance holding a heavy object is released, it will read:
Question 39 :
A false balance has equal arms. An object weights $\displaystyle { w }_{ 1 }$ when placed in one pan and $\displaystyle { w }_{ 2 }$ when placedin the other pan. Then weight w of the object is
Question 40 :
If action force acting on a body is gravitational in nature, the reaction force:
Question 42 :
A force $F_1$ acts on a particle to acclerate it from rest to a velocity v. The force $F_1$ is then replaced by force $F_2$ which of the following statements is true ?
Question 43 :
Force acting on a body is given by $F=(1200-4\times 10^{5}t)\ N$. After starting the motion to it moves with constant velocity, how much impulse of force is acting on it?
Question 44 :
Calculate the momentum of a bullet of $25\ g$ when it is fired from a gun with a velocity of $100\ m/s$:
Question 46 :
Impulse 0.45 is applied to a 200 g model rocket at rest what will be its final speed? (neglect gravity)
Question 47 :
A diwali rocket is ejecting $ 0.05 $ kg of gases per second at a velocity of $400$ m/sec. The accelerating force on the rocket is
Question 48 :
The momentum of a 10 kg body moving at 36 km/h is:
Question 49 : Which of the following equations or principle is most suitable to solve given question. <div>A string is stretched by 1,000 N force. Calculate the tension in the string.</div>
