Chapter 3: Dynamics – I + Chapter 4: Dynamics – II

2. Ahmed is learning about force in his physics class. His teacher explains that force is a push or pull that can change the state of motion of an object. Which of the following is an example of a force?

3. 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?

4. Waseem is studying the stability of objects. He knows that a cone lying on its side is in neutral equilibrium. What happens if it is displaced?

5. Nora is studying rolling friction. She knows that rolling friction is smaller than sliding friction. Why is rolling friction less than sliding friction?

6. 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?

7. Impulse is equal to:

8. Rania is studying net force. She understands that net force is the vector sum of all forces. If forces of 8 N and 6 N act at right angles to each other, what is the magnitude of the net force?

9. Ming is studying the effect of friction on a moving object. He knows that friction always opposes motion. What is an advantage of friction?

10. Inertia depends upon:

11. Uma is studying the principle of moments. She knows that the principle of moments states that for a body in equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments. What is the principle of moments?

12. 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?

13. Greater mass means:

14. Aisha is learning about mass and weight. She understands that weight is a force. What is the unit of weight?

15. Weight of a body depends upon:

16. Nora is studying the disadvantages of friction. She knows that friction causes energy loss in machines. What is a method to reduce friction?

17. Vera is learning about types of forces. She understands that tension is a force transmitted through a string. What is the direction of tension in a string?

18. Uma is studying the conditions of equilibrium. She knows that for a body to be in equilibrium, the sum of all forces and the sum of all torques must be zero. What is the second condition of equilibrium?

19. Mohamed is learning about impulse and change in momentum. He understands that impulse is force multiplied by time. A force of 10 N acts on an object for 3 seconds. What is the impulse?

20. According to Newton’s First Law, a body remains at rest if:

21. David is studying fundamental forces in nature. He learns that there are four fundamental forces. Which of the following is the weakest fundamental force?

22. Paula is studying contact and non-contact forces. She understands that magnetic force is a non-contact force. Which of the following is an example of a magnetic force?

23. Bongani is studying momentum. He learns that momentum is a vector quantity. Which of the following is the direction of momentum?

24. Ahmed is studying the concept of force. He knows that force is a push or a pull. What is the SI unit of force?

25. When brakes are applied, passengers move forward due to:

26. Inertia is the property of a body due to which it:

27. Unit of gravitational field strength N/kg is equivalent to:

28. George is learning about Newton's second law of motion. He understands that force equals mass times acceleration (F = ma). If a 10 kg object is accelerated at 2 m/s², what is the force acting on it?

29. George is studying the concept of equilibrium. He knows that a body is in equilibrium if it is at rest or moving with uniform velocity. What is the first condition of equilibrium?

30. Which is NOT a fundamental force?