# Can a balanced force change the state of rest or of motion of an object? Which force always opposes the motion of an object? Name three types of inertia. What is another name for Newton’s First Law? When a wheel rotates at a high speed, in which direction will the mud sticking to the wheel fly off? If force is kept constant and mass is doubled what will be the acceleration? What is the significance of negative sign while calculating the recoil velocity of the rifle? If two masses are in the ratio 1:2, what is the ratio of their inertia? Why does a gun recoil? 10. Why do action and reaction force not cancel by each other?11. What is the momentum of a 36kg mass moving with a speed of 36km/hr?12. Why does a cricket fielder pull his hand while catching a ball?13. Relate kg wt with Newton.14. What do you mean by impulse?15. How much is the force on 1 kg mass if it gets an acceleration of 1 ms-2?16. The force of attraction between two bodies is 20N. Calculate The force between them when mass of each body as well as the distance between them is halved.17. Any luggage kept on the roof of cars or buses is always tied with a rope. Why?18. If two masses in the ratio 3:5 are to be accelerated by forces in the ratio 5:3, fid the acceleration ratio.19. Why are we hurt more during a fall, on a concentrate structure than on a sandy track?20. Which one requires more force-accelerating 10g mass at 5ms-2 or a 20g mass at 2ms-2?21. An object moves with an acceleration of 8ms-2 starting from rest. Find the distance travelled in one second.22. A bullet of mass 20g is fired from a gun weighing 5kg. If the velocity of the bullet is 500m/s, what will be the speed of the recoiling gun?23. A 1000kg mass having a speed of 10m/s is brought to rest over a distance of 100m. Find retardation and the retarding force.24. A mass of 12kg is to be accelerated to 2m/s2. If the force is doubled, find the acceleration produced. Find the force required in both the cases.25. If someone jumps to the shore from a boat, the boat moves in opposite direction. Explain, why?26. Why is it dangerous to jump out of a moving bus?27. A motorcycle is moving with a velocity of 90km/h and it takes 5s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcycle if its mass along with the rider is 200kg.28. Two similar trucks are moving with same velocity on a road. If one is loaded and the other is empty, which will require more force to stop in same time? How?29. Two objects of masses 100g and 200g are moving along the same line with velocities of 2m/s and 1m/s, respectively. They collide and after the collision, the first object moves at a velocity of 1.67m/s. Determine the velocity of the second object.30. A hockey ball of mass 200g travelling at 10m/s is struck by a hockey stick so as to return it along its original path with a velocity at 5m/s. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.31. A bullet of mass 10g travelling horizontally with a velocity of 150m/s strikes a stationary wooden block and comes to rest in 0.03s. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude of the force exerted by the wooden block on the bullet.32. An object of mass 1kg travelling in a straight line with a velocity of 10m/s collides with, and sticks to, a stationary block of mass 5kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.33. An object of mass 100kg is accelerated uniformly from a velocity of 5m/s to 8m/s in 6s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object. 34. The speed-time graph of a car of 1000kg mass is given below. On the basis of this answer the following questions:      20 A B 15 10        5 C2 4 6 8 10 12 (i) When is the maximum force acting on car? (ii) What is the retarding force acting on the car? (iii) For how long is there no force acting on the car? (iv) What is the velocity of the car after 4 seconds? (v) Find the acceleration of the car during each of the first two intervals of four second each?35. A bullet of mass 10g is fired at a speed of 500m/s from a gun of mass 5kg. What is the recoil velocity of the gun?36. A 10N force accelerates a body by 2m/s2 and a20N force accelerates another body by 4m/s: When the masses are tied together, find the acceleration with: (i) Only 10N (ii) Only 20N (iii) Both 10N and 20N acting on them.37. Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer.38. Two identical bullets are fired one by a light rifle and another by a heavy rifle with the same force. Which rifle will hurt the shoulder more and why?

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No, a balanced force cannot bring about change in the state of rest or motion of  a body.