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question_answer1) If A and B are two objects with masses 6 kg and 34 kg respectively, then (a) A has more inertia than B, (b) B has more inertia than A, (c) A and B have the same inertia, (d) none of the two has inertia.
question_answer2) Why does an athlete runs some distance before taking a long jump?
question_answer3) Why does a rider on a horseback falls forward when the horse suddenly stops?
question_answer4) Choose the correct statement/s. (a) A force can move a body from rest. (b) A force can change the direction of a moving body. (c) A force can increase the mass of a body.
question_answer5) What happens when you shake a wet piece of cloth? Explain your observation.
question_answer6) Why it is advised to tie the luggage with a rope on the roof of buses?
question_answer7) The momentum of a cube of length 10 cm is A-units. Find the momentum of a another cube made of same material of length 20 cm that has the same velocity as that of the first cube.
question_answer8) The velocity of a iron sphere of radius r units V units. What is the velocity of another iron sphere of radius 1r units, with the same momentum as that of the first one?
question_answer9) A body of mass 25 kg has a momentum of 125 kg m/s. What is its velocity?
question_answer10) Calculate the change in momentum of a body weighing 5 kg when its velocity decreases from 20 m/s to 0.20 m/s?
question_answer11) The rate of change of momentum acting on a body is\[\text{5 kg m}{{\text{s}}^{-\text{2}}}\]. Find the force acting on the body.
question_answer12) A cricket ball of mass 100 g strikes the hands of a player with a velocity of 20 m/s and is brought to rest in 0.01 s. What is the force applied by the hands of the player?
question_answer13) A force acts for 8 seconds on a body of mass 10 kg. The force then stops acting and the body describes 80 m in the next 5s. Find the force.
question_answer14) A machine gun fires a bullet of mass 40gm with a velocity of 1200 m/s. The man holding it can exert a force of 144 N on the gun. How many bullets can he fire per second at the most?
question_answer15) The velocity - time graph of a particle moving on the ground is shown in figure. If the mass of the particle is 250 g, find the force acting on the particle.
question_answer16) Displacement-time graph of a moving body is shown in the figure. How much force is acting on the body?
question_answer17) From the velocity-time graph find the force acting on a body of mass 100 g?
question_answer18) There are two bodies of masses 14 g and 28 g respectively.
question_answer19) Find the ratio of the force acting on them from the velocity-time graph. On turning a comer, a motorist rushing at 36 km/hr, finds a child 51 m ahead. He stops the car within one metre of the child by the application of brakes. Calculate the retarding force and the time required to stop the car. The total weight of the car and passenger is 2000 kg.
question_answer20) A raindrop is striking the top surface of a car at \[um/\sec \]and comes to rest after striking. The mass of rain falling per second is k kg/sec on unit area of the car. Find the force exerted by the rain on top surface of the car, if the car has surface area of \[x\,{{\text{m}}^{\text{2}}}\].
question_answer21) A 250 g ball moving at 20 m/s is stopped by a player in 0.01 second. What impulse did the ball exert on to player's hand?
question_answer22) A body of mass 100 kg moving in a straight line with a velocity of 30 m/s, moves in the opposite direction with a velocity of 20 m/s after hitting a wall. What is its magnitude of impulse?
question_answer23) What will be the impulse acting on a body at rest when acted upon by a force of 4 N for 2s?
question_answer24) The action and reaction forces referred to in Newton's third law (a) Must act on the same objects (b) May act on different objects (c) Must act on different objects (d) Need not be equal in magnitude but must have the same direction
question_answer25) If action is of 10 N, then reaction will be of (a) 10 N in the same direction (b) 20 N in the same direction (c) 10 N in opposite direction (d) 20 N in opposite direction
question_answer26) The law which gives the properties of force is (a) Newton's first law of motion (b) Newton's second law of motion (c) Newton's third law of motion (d) None of these
question_answer27) The earth attracts a stone towards itself with a force of 10 N. Then the force with which the stone attracts the earth is (a) Zero (b) 20 N (c) 10 N (d) None of these
question_answer28) Conservation of linear momentum is a direct consequence of (a) Newton's first law of motion (b) Newton's second law of motion (c) Newton's third law of motion (d) None of these
question_answer29) A railway engine of mass 10,000 kg moving with a velocity of 2 m/s collides with a wagon of 20,000 kg at rest. After collision both move with the same velocity. Then find the common velocity.
question_answer30) A truck of mass 500 kg moving at 4 m/s collides with another truck of mass 1500 kg moving in the same direction at 2 m/s. What is their common velocity just after the collision if they move together?
question_answer31) A body of mass \['{{m}_{1}}'\] moving with a velocity of 40 m/s hits another body of mass \[{{m}_{2}}\] which is at rest. After the impact, both the bodies move with common velocity of 30 m/s. Find the ratio of their masses.
question_answer32) A girl is suspended motionless from the ceiling by two ropes. Draw FBD for a girl suspended from the ceiling.
question_answer33) An egg is free-falling from a nest in a tree. Neglect air resistance. Draw FBD a free-body diagram for the egg, falling freely from a nest.
question_answer34) A block of mass m is attached with two strings as shown in figure. Draw the free body diagram of the block.
question_answer35) When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by (a) The cart on the horse (b) The ground on the horse (c) The ground on the cart (d) The horse on .the ground
question_answer36) Read the following passage and answer the question given below: One end of a spring is attached to a fixed vertical support and the other end to a block which can move on a horizontal table. Let \[x=0\] denote the position of the block when the spring is in its natural length. When the block is displaced by an amount\[x\] (either compressed or elongated) a restoring force(F) is applied by the spring on the block. The direction of this force F is always towards its mean position \[(x=0)\] and the magnitude is directly proportional to\[x\]or \[F\propto x\]or\[F=-kx\]where k is a constant called force constant of spring and depends on the nature of the spring. A particle of mass 0.3 kg is subjected to a force \[F=-kx\] with k = 15 N/m. What will be its initial acceleration if it is released from a point\[x=\text{2}0\text{cm}\]?
question_answer37) Both the springs shown in figure are unscratched. If the block is displaced by a distances and released, what will be the initial acceleration? [Hint: Net force acting on the block = force due to first spring + force due to second spring]
question_answer38) Two blocks of mass 4 kg and 2 kg are placed side by side on a smooth horizontal surface as shown in the figure. A horizontal force of 20 N is applied on 4 kg block. Find (a) the acceleration of each block (b) the normal reaction between two blocks.
question_answer39) A block of 2 kg is suspended from the ceiling through a massless spring of spring constant k = 100 N/m. What is the elongation of the spring? If another 1 kg is added to the block, what would be the further elongation?
question_answer40) Suppose the ceiling in the previous problem is that of an elevator which is going up with an acceleration of 2.0 m/s. Find the elongations, [\[\text{g}=\text{1}0\text{m}/{{\text{s}}^{\text{2}}}\]]
question_answer41) Two blocks of equal mass m are tied to each other through a light string. One of the blocks is pulled along the line joining them with a constant force F. Find the tension in the string joining the blocks.
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