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question_answer1) While playing carroms, we often make a 'tower' of the 'carrom men'. If we now strike at the lowermost carrom men, we find that this carom man moves out of the tower, but the rest of the tower stays intact. Why is it so?
question_answer2) Why a bullet fired from a gun makes a small hole in the window pane while passing through it, but a stone striking the window pane breaks it into pieces?
question_answer3) A rotating fan does not come to rest immediately, when you switch it off. Why?
question_answer4) Why a person falls forward, while getting down from a running bus?
question_answer5) Why a person bends towards the centre of the turn, when the car he is sitting in, takes a turn?
question_answer6) During the sharpening of a knife against a grinding wheel, the sparks from the rim of the wheel always fly tangentially. Why?
question_answer7) Take two eggs, a raw egg and a hardboiled egg. Try to spin both the eggs with the same force on the same surface. Which one will spin for more time? You can see that the hardboiled egg spins for more time than the raw egg. What made the boiled egg spin for more time? Can you explain? If you cannot, do not get mystified. The upcoming pages will give a helping hand to answer the Thrill in Store.....
question_answer8) Try to stop a cricket ball and a tennis ball moving with the same velocity. Which one is difficult to stop? Why?
question_answer9) Try to stop two cricket balls moving with different velocities. Which one is difficult to stop? Why?
question_answer10) Which one requires more force to move? (a) To move a body of mass 10 kg with an 2 acceleration of \[\text{5}0\text{ m}/{{\text{s}}^{\text{2}}}\]or (b) To move a body of mass 1000 mg with an acceleration of\[\text{1}000\text{ cm}/{{\text{s}}^{\text{2}}}\]
question_answer11) A lorry and a car are moving with the same acceleration. Which requires more force to stop it?
question_answer12) A lorry and a car are moving with the same velocity. When the same force is applied to stop them, (i) Which one takes more time to come to a halt? (ii) Which one travels more distance before coming to rest?
question_answer13) Why does a cricket player lower his hands while catching a ball?
question_answer14) Two bodies, one fight and the other heavy, are acted upon by the same amount of force. In which body is the rate of change of velocity greater?
question_answer15) Assume that life has existed on the surface of the Moon, without changing its present acceleration due to gravity i.e., one sixth that on the surface of the Moon. If 5 kg weight of sugar is purchased on the Earth and the Moon, how many cups of tea can be made out of it on the Earth and the Moon respectively? Note: From 100 g of sugar 10 cups of tea can be made on the earth \[(\text{g}=\text{1}0\text{m}{{\text{s}}^{-\text{2}}})\]
question_answer16) Imagine a hypothetical case, where you and your friend are playing with a spring balance and common balance, respectively, weighing some objects. Some miracle happened, a room was shifted to the Mars. Without coming out can easily find it out: you or your friend? Why?
question_answer17) If you have to purchase 100 kg weight of gold, which place would you prefer the Earth or the moon? Similarly, if you have to sell gold, which place you prefer - The earth or the moon? Explain.
question_answer18) On the earth, a Sumo of 400 kg is checking his reading on a spring balance. To have the same reading of spring balance on the moon, 6 Sumos of mass 400 kg each should stand on it. Explain, (\[\text{g}=\text{1}0\text{m}{{\text{s}}^{-\text{2}}}\])
question_answer19) When we hit a wall with our hand, we are exerting a force on the wall. Then, why do we feel pain in our hand?
question_answer20) While swimming, the swimmer always moves forward by pushing the water back. Why is it so?
question_answer21) Why does a ball rebounce, when it is dropped on the floor?
question_answer22) Why does a boatman push the river bank with a bamboo pole to take his boat into the river?
question_answer23) The earth appears to move backward, when you walk forward. Why?
question_answer24) The bodies of same mass are moving towards each other with same velocity. On colliding with each other, will they come to a standstill or rebounce with same velocity?
question_answer25) A rocket moves up while the gases move down. Explain this.
question_answer26) How do you express linear momentum of a body of mass m and velocity v?
question_answer27) What is the momentum of a man of mass 75 kg when he walks with a uniform velocity of 2 m/s?
question_answer28) A force can be completely described by (a) Its magnitude only (b) Its direction only (c) Its magnitude and direction only (d) Neither its magnitude nor its direction only
question_answer29) The unit kg-m/s unit of (a) Force (b) Velocity (c) Acceleration (d) Impulse
question_answer30) Change in momentum is same as (a) Force (b) Impulse (c) Velocity (d) Acceleration
question_answer31) The weight of an object (a) Is the gravity of the matter it contains (b) Refers to its inertia (c) Is the same as its mass but expressed in different units (d) Is the force with which it is attracted to the earth
question_answer32) The rate of change of momentum of a body falling under gravity is equal to its. (a) Impulse (b) Acceleration (c) Velocity (d) Weight
question_answer33) A man is at rest in the middle of a pond on perfectly smooth ice. He can reach the shore by making use of Newton's (a) First law (b) Second law (c) Third law (d) All the laws
question_answer34) A rocket moves according to the principle of conservation of _______
question_answer35) Father has mass 60 kg and the mass of his son is kg. What is the ratio of the inertia of the father to the inertia of his child?
question_answer36) What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to 72 km/h uniformly?
question_answer37) If a constant force is applied to a mass, it moves with a uniform (a) Velocity (b) Acceleration (c) Speed (d) Momentum
question_answer38) If the mass of a body is doubled, its acceleration will (if applied force remains same) (a) Become double (b) Become half (c) Become four times (d) Not change
question_answer39) Whenever an object A exerts a force on another object B, object B will exert a return force on object A. The two forces are (a) Equal in magnitude and in same direction (b) Equal in magnitude but opposite in direction (c) Not equal and in opposite direction (d) Not equal and in the same direction
question_answer40) A Jet engine works on the principle of Newton's (a) First law (b) Second law (c) Third law (d) None of these
question_answer41) Three blocks of mass 3 kg, 2 kg and 1 kg are placed side by side on a smooth surface as as shown in figure. A horizontal force of 12 N is applied on 3 kg block. Find the net force on 2 kg block.
question_answer42) Three blocks of mass 1 kg, 4 kg and 2 kg are placed on a smooth horizontal plane as shown in figure. Find (a) The acceleration of the system. (b) The normal force between 1 kg block and 4 kg block. (c) The net force on 2 kg block.
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