1. Ming is studying the disadvantages of friction. She knows that friction causes energy loss. What is a method to reduce friction in machines?
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Chapter 4: Dynamics – II
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2. Unit of impulse is:
3. The mathematical form of Newton’s Second Law is:
4. Quinn is studying centripetal force. He knows that centripetal force is directed towards the center of the circular path. What is the direction of centripetal force?
5. A couple is formed by:
6. Unit of force in SI system is:
7. Principle of conservation of momentum states that:
8. Sam is studying the conditions of equilibrium. She knows that for a body to be in equilibrium, both the resultant force and the resultant torque must be zero. What is the first condition of equilibrium?
9. SI unit of momentum is:
10. Sam is studying the average orbital speed of satellites. She knows that the orbital speed is given by the formula v = 2πr/T. What does T represent in the formula?
11. Patricia is studying fluid friction. She knows that fluid friction is the resistance offered by fluids. What is another term for fluid friction?
12. Khalid is studying friction. He knows that friction is a force that opposes motion. Which type of friction is the largest?
13. Ibrahim is studying the motion of a car on a curved road. He knows that the car needs a force to keep it moving in a circle. What is this force called?
14. Waseem is studying the center of mass. He knows that the center of mass is the point where the entire mass of a body can be considered to be concentrated. For a uniform rectangular plate, where is the center of mass located?
15. Julia is studying the stability of objects. She knows that a cone standing on its base has stable equilibrium. What type of equilibrium does a cone standing on its tip have?
16. Fatima is analyzing the stability of a ball resting on a flat floor. If she pushes it slightly, it rolls and comes to a stop at a new position. What type of equilibrium does the ball have?
17. Momentum of a body depends on:
18. Oliver is studying fluid friction. He knows that fluid friction is the resistance offered by fluids. Which of the following is an example of fluid friction?
19. George is trying to slide a heavy box across the floor. He finds it difficult to start moving the box, but once it moves, it requires less force. What concept explains this observation?
20. David is balancing a seesaw with two friends of different weights. He moves the heavier friend closer to the pivot to balance it. What principle is he applying?
21. Why does a gun recoil when a bullet is fired?
22. Quinn is studying the center of mass of a body. He knows that the center of mass is the point where the entire weight of the body can be considered to act. For a uniform rod, where is the center of mass located?
23. Lara is studying the advantages of friction. She knows that friction is useful in many situations. Which of the following is an advantage of friction?
24. Nora is studying the disadvantages of friction. She knows that friction causes energy loss in machines. What is a method to reduce friction?
25. Zara is studying the methods of reducing friction. She knows that friction can be reduced in various ways. Which method is used to reduce friction between moving parts of machines?
26. Rachel is studying orbital motion. She knows that the Moon orbits Earth due to gravity. What is the centripetal force for the Moon's orbit?
27. Ibrahim is studying the center of mass. He knows that the center of mass of a body is the point where the body can be balanced perfectly. For a uniform sphere, where is the center of mass located?
28. Which of the following increases impulse?
29. Lara is analyzing the forces acting on a book placed on a table. The book is at rest. What is the net force acting on the book?
30. Xia is studying friction. She knows that friction is a force that opposes relative motion. What is the direction of the frictional force on a box being pushed to the right?