Class 9 Practice Level 1 – Force and Laws of Motion Leave a Comment / By anushka kumari / July 8, 2024 Class 9 Practice Level 1 – Force and Laws of Motion Total questions: 40 1. What is the SI unit of force? Kilogram Meter Newton Joule None 2. Which of the following is an example of Newton's First Law of Motion? A car accelerating A ball rolling and eventually stopping A rocket launching Two students pushing on opposite sides of a table but it is static None 3. Inertia is the tendency of an object to: Change its state Remain at rest Remain in motion Both b and c None 4. According to Newton's Second Law of Motion, force is equal to: Mass × velocity Mass × acceleration Mass × distance Mass × time None 5. Newton's Third Law of Motion states that for every action, there is an equal and opposite: Force Motion Reaction Inertia None 6. Which of the following describes balanced forces? Forces that cause acceleration Forces that cause deceleration Forces that cancel each other out Forces that change direction None 7. Unbalanced forces can cause an object to: Remain stationary Change its state of motion Remain in uniform motion Both a and c None 8. Weight is the force exerted by: Mass Velocity Gravity Acceleration None 9. Momentum is the product of: Mass and velocity Mass and acceleration Force and distance Force and time None 10. When you push against a wall, the wall pushes back with: Less force More force Equal force No force None 11. Frictional force always acts: In the direction of motion Opposite to the direction of motion Perpendicular to the direction of motion At an angle to the direction of motion None 12. In a free body diagram, forces are represented by: Points Lines Arrows Circles None 13. Which of the following is a contact force? Gravitational force Magnetic force Frictional force Electrostatic force None 14. The gravitational force between two objects depends on: Their masses and the distance between them Their velocities and the distance between them Their accelerations and the distance between them Their volumes and the distance between them None 15. Acceleration is the rate of change of: Distance Velocity Time Mass None 16. A force of 10 N is applied to a mass of 2 kg. What is the acceleration produced? 20 m/s² 5 m/s² 10 m/s² 2 m/s² None 17. The law of conservation of momentum states that the total momentum of a system remains constant if: The system is at rest The system is in motion No external forces act on the system The system is accelerating None 18. An object will accelerate when: Balanced forces act on it Unbalanced forces act on it No forces act on it No change in direction of movement None 19. Which object has more inertia? A 1 kg mass A 5 kg mass A 10 kg mass A 20 kg mass None 20. When two forces of 10 N and 15 N act on an object in the same direction, the resultant force is: 5 N 10 N 15 N 25 N None 21. The net force on an object is zero if it: Is at rest Is in uniform motion Has balanced forces acting on it All of the above None 22. If the mass of an object is doubled, and the applied force remains the same, the acceleration will: Double Remain the same Be halved Be zero None 23. An object is said to be in equilibrium when: It is moving with constant velocity It is at rest The net force acting on it is zero All of the above None 24. Friction between two surfaces can be reduced by: Making the surfaces rougher Increasing the weight of the objects Using lubricants Increasing the contact area None 25. Which of the following is a non-contact force? Frictional force Gravitational force Tension force Applied force None 26. If the mass of an object on Earth is 10 kg, what is its weight? (g = 9.8 m/s²) 10 N 98 N 100 N 9.8 N None 27. The normal force is exerted by a surface in which direction? Parallel to the surface Perpendicular to the surface Opposite to the surface At an angle to the surface None 28. Centripetal force acts: Away from the center of a circular path Towards the center of a circular path Perpendicular to the direction of motion In the direction of motion None 29. Which law explains why passengers move forward in a car when it suddenly stops? Newton's First Law Newton's Second Law Newton's Third Law Law of Gravitation None 30. Which type of friction is the strongest? Static friction Sliding friction Rolling friction Fluid friction None 31. An object in free fall experiences? Balanced forces No forces Only gravitational force Frictional force None 32. When you walk, the reaction force to your foot pushing on the ground is because of? The ground pushing back on your foot The air pushing on your foot Your foot moving forward Gravity pulling you down None 33. If a force of 20 N is applied to a 4 kg mass, what is the acceleration? 80 m/s² 5 m/s² 20 m/s² 4 m/s² None 34. In circular motion, the direction of velocity is? Towards the center Along the tangent to the path Away from the center Perpendicular to the tangent None 35. Gravity on the surface of the moon is about: The same as on Earth One-sixth of Earth's gravity Twice as much as Earth's gravity One-third of Earth's gravity None 36. A force of 15 N is applied to an object, producing an acceleration of 3 m/s². What is the mass of the object? 5 kg 10 kg 15 kg 45 kg None 37. Kinetic friction occurs when: An object is at rest An object is moving An object is accelerating An object is decelerating None 38. Impulse is the product of: Force and velocity Mass and velocity Force and distance Force and time None 39. Which law explains why a swimmer pushes the water backwards to move forward? Newton's First Law Newton's Second Law Newton's Third Law Law of Gravitation None 40. Terminal velocity is achieved when: Gravitational force is greater than air resistance Air resistance is greater than gravitational force Gravitational force equals air resistance There is no gravitational force None 1 out of 40 Time's up