1. When two forces of 10 N and 15 N act on an object in the same direction, the resultant force is:

A. 5 N B. 10 N C. 15 N D. 25 N

2. The unit of force in the SI system is:

A. Newton (N) B. Joule (J) C. Watt (W) D. Pascal (Pa)

3. A 10 kg object is pulled horizontally with a 50 N force. If the frictional force is 30 N, what is the acceleration?

A. 1 m/s² B. 2 m/s² C. 3 m/s² D. 5 m/s²

4. An object moves with uniform velocity on a surface with friction. The net force acting on it is:

A. Zero B. Equal to friction force C. Equal to applied force D. Equal to mass times acceleration

5. If two forces of 5 N and 3 N act in the same direction on an object, the net force is:

A. 8 N B. 2 N C. 15 N D. 1.5 N

6. The net force on an object moving in a circle at constant speed is called:

A. Centripetal force B. Gravitational force C. Frictional force D. Normal force

7. The acceleration of a free-falling object near Earth's surface is approximately:

A. \( 9.8 \, m/s^2 \) B. \( 1 \, m/s^2 \) C. \( 0 \, m/s^2 \) D. \( 20 \, m/s^2 \)

8. Two forces of equal magnitude but opposite directions act on an object. What is the net force?

A. Zero B. The sum of the forces C. Equal to one of the forces D. Depends on the mass of the object

9. The net force acting on an object moving with constant velocity is:

A. Zero B. Positive C. Negative D. Increasing

10. If an object experiences a net force and moves with a constant velocity, what can be concluded about the situation?

A. Contradicts Newton’s laws B. Forces are balanced C. There is friction acting opposite to motion equal to the applied force D. Both B and C

11. An object of mass 3 kg accelerates from rest at \( 4 \, m/s^2 \). The force applied is:

A. 12 N B. 7 N C. 1.33 N D. 0.75 N

12. According to Newton’s Second Law, when force is zero, the acceleration is:

A. Zero B. Positive C. Negative D. Infinite

13. The acceleration of an object moving under a constant force is:

A. directly proportional to the force and inversely proportional to its mass B. independent of its mass C. only dependent on its initial velocity D. inversely proportional to the force

14. If an object is moving with acceleration \( a \) produced by a net force \( F \), doubling the mass will:

A. Halve the acceleration B. Double the acceleration C. Keep acceleration unchanged D. Reduce the force

15. The relationship between force \( F \), mass \( m \), and acceleration \( a \) indicates that acceleration is:

A. Directly proportional to force and inversely proportional to mass B. Directly proportional to mass and inversely proportional to force C. Independent of mass and force D. Equal to force divided by acceleration

16. According to Newton’s Third Law, when object A exerts a force on object B, object B will exert:

A. An equal and opposite force on object A B. No force on object A C. A smaller force on object A D. A larger force on object A

17. The effect of increasing the coefficient of friction on acceleration is:

A. Decrease acceleration B. Increase acceleration C. No effect on acceleration D. Make acceleration infinite

18. The formula to calculate acceleration \( a \) when force \( F \) and mass \( m \) are known is:

A. \( a = \frac{F}{m} \) B. \( a = F \times m \) C. \( a = \frac{m}{F} \) D. \( a = F + m \)

19. The force that resists the relative motion of solid surfaces in contact is called:

A. Frictional force B. Gravitational force C. Normal force D. Tension force

20. Which equation correctly expresses Newton’s Second Law?

A. F = m + a B. F = ma C. F = m / a D. F = m - a

21. The formula for impulse \( J \) when force \( F \) acts over time \( \Delta t \) is:

A. \( J = F \Delta t \) B. \( J = \frac{F}{\Delta t} \) C. \( J = F + \Delta t \) D. \( J = F - \Delta t \)

22. An object is pulled with a force \( F \) on a rough surface causing acceleration \( a \). Which equation represents this?

A. \( F - f = ma \), where \( f \) is friction B. \( F = ma + f \) C. \( F + f = ma \) D. \( f = ma \)

23. If a force of 20 N is applied to an object causing an acceleration of 4 m/s², what is the mass of the object?

A. 5 kg B. 80 kg C. 16 kg D. 24 kg

24. The kinetic friction force depends on:

A. The normal force and coefficient of kinetic friction B. The velocity only C. The object’s mass only D. The gravitational force only

25. Newton's First Law of Motion states that an object will remain at rest or in uniform motion unless acted upon by:

A. An external force B. Gravitational force only C. Centripetal force D. Magnetic force

26. Frictional force acting opposite to motion is an example of:

A. Balanced force B. Unbalanced force causing acceleration C. Force that always increases speed D. Force that acts to oppose motion

27. The tension in a string under ideal conditions is:

A. Uniform throughout the string B. Variable along the string C. Zero D. Always greater at the fixed end

28. Which of the following best describes inertia?

A. A force that opposes motion B. The tendency of an object to resist change in its state of motion C. The acceleration produced per unit force D. The change in velocity over time

29. When the two forces act in opposite directions, their net force is:

A. The difference between magnitudes B. The sum of magnitudes C. Zero always D. Product of magnitudes

30. In the absence of air resistance, the acceleration of all freely falling objects near Earth’s surface is:

A. The same, regardless of mass B. Different for different masses C. Zero for heavier objects D. More for lighter objects

31. In an example where a force of 10 N acts on a 2 kg object, the acceleration is:

A. \( 5 \, \text{m/s}^2 \) B. \( 20 \, \text{m/s}^2 \) C. \( 12 \, \text{m/s}^2 \) D. \( 8 \, \text{m/s}^2 \)

32. According to Newton’s First Law of Motion, an object will remain at rest or in uniform motion unless:

A. acted upon by a balanced force B. acted upon by an unbalanced force C. accelerating due to gravity D. in a vacuum

33. The weight \( W \) of an object is related to its mass \( m \) and gravitational acceleration \( g \) by:

A. \( W = mg \) B. \( W = \frac{m}{g} \) C. \( W = mg^2 \) D. \( W = m + g \)

34. Frictional force always acts:

A. Opposite to the direction of motion B. In the direction of motion C. Perpendicular to motion D. Randomly

35. The unit of force in the International System (SI) is:

A. Watt B. Joule C. Newton D. Pascal

36. Which force causes a change in an object’s motion?

A. Net external force B. Internal force C. Weight only D. Normal force in equilibrium

37. The acceleration of an object in free fall is due to:

A. Gravitational force B. Frictional force C. Normal force D. Applied force

38. The formula to calculate displacement \( s \) when acceleration \( a \), initial velocity \( u \), and time \( t \) are known is:

A. \( s = ut + \frac{1}{2}at^2 \) B. \( s = ut - \frac{1}{2}at^2 \) C. \( s = u + at \) D. \( s = a + ut \)

39. In the absence of friction, what happens to an object once a force ceases to act on it?

A. It immediately stops B. It continues to move with constant velocity C. It accelerates D. Its mass changes

40. Newton’s Second Law of Motion states that the acceleration of an object depends on:

A. its velocity and mass B. the net external force and its mass C. the velocity and forces acting on it D. only the force applied

41. In Example 3, if the friction force equals the applied force, the acceleration will be:

A. Zero B. Positive C. Negative D. Constant non-zero

42. The magnitude of momentum \( p \) is given by:

A. \( p = mv \) B. \( p = \frac{m}{v} \) C. \( p = m + v \) D. \( p = v - m \)

43. If a net force acting on an object is zero, what can be said about the object’s motion?

A. The object must be speeding up B. The object remains stationary or moves with constant velocity C. The object must be slowing down D. The object’s mass changes

44. What is the reaction force to the object's weight according to Newton's Third Law?

A. The weight force exerted by the object on the Earth B. The gravitational pull by Earth only C. The force applied by a person holding the object D. The friction force acting on the object

45. If a body’s mass is doubled and force applied remains the same, the acceleration:

A. Is halved B. Is doubled C. Remains the same D. Becomes zero

46. What is the normal force acting on an object resting on a horizontal surface?

A. Equal and opposite to the object's weight B. Zero C. Equal to the applied force D. Twice the object's weight

47. An object of mass 5 kg accelerates at 2 m/s². What is the net force acting on the object?

A. 2.5 N B. 7 N C. 10 N D. 25 N

48. Which law explains the relation \( F = ma \)?

A. Newton’s Second Law B. Newton’s First Law C. Newton’s Third Law D. Law of Conservation of Momentum

49. When forces are balanced on an object:

A. The object remains at rest or moves with constant velocity B. The object accelerates C. The object changes direction suddenly D. The object loses mass

50. What force must be applied to a 4 kg object to produce an acceleration of \( 3 \, m/s^2 \)?

A. 12 N B. 7 N C. 1.33 N D. 0.75 N