Class 9 Science Chapter 6 How Forces Affect Motion – Latest Concept Clarity MCQs with Answers | New NCERT Book 2026–27 Edition
Welcome to our Class 9 Science Chapter 6 How Forces Affect Motion Concept Clarity MCQs with Answers. This practice set contains latest MCQs based on the new NCERT Class 9 Science Book 2026–27 Edition and is designed to help students strengthen their understanding of important concepts related to force, motion, balanced and unbalanced forces, and their effects on the motion of objects.
These concept-based MCQs focus on understanding rather than memorisation, helping students test their conceptual clarity and identify areas that need improvement. The questions are ideal for Class 9 students preparing for school examinations, revision, and concept-based assessments according to the latest NCERT textbook and syllabus for the 2026–27 academic session.
How Forces Affect Motion Current Concept Clarity MCQs with Answers:-
Q1. A force acts on a moving object, but its speed remains constant. Which of the following could have happened?
a. its direction changed
b. its mass increased
c. its weight became zero
d. its shape remained unchanged
Q2. Which statement correctly explains why force is a vector quantity?
a. it has magnitude only
b. it has direction only
c. it has magnitude and direction
d. it has magnitude and unit only
Q3. Two children pull a toy in opposite directions with forces of 80 N and 55 N. The net force is:
a. 135 N towards the larger force
b. 25 N towards the larger force
c. 25 N towards the smaller force
d. 135 N towards the smaller force
Q4. A ball floats at rest on water. The upward buoyant force is 12 N. What is the magnitude of the gravitational force acting on it?
a. 0 N
b. 6 N
c. 12 N
d. greater than 12 N
Q5. A student pushes a box with a force of 30 N, but the box remains at rest. Which explanation is most consistent with the textbook?
a. no force acts on the box
b. friction balances the applied force
c. gravity acts horizontally
d. the box has no mass
Q6. A moving object loses contact with a stretched rubber band. The rubber band's force disappears, but friction continues acting. What happens to the object's velocity?
a. it increases continuously
b. it decreases gradually
c. it becomes infinite
d. it remains constant in all circumstances
Q7. Which statement correctly describes Newton’s First Law of Motion?
a. every object eventually stops
b. force is needed continuously to maintain all motion
c. an object maintains its state unless a net force acts
d. every applied force produces motion from rest
Q8. A spacecraft is moving with constant velocity in a region where the net force on it is zero. What does Newton’s First Law predict?
a. it gradually slows down
b. it continues with constant velocity
c. it must accelerate
d. it immediately stops
Q9. A student says, “If no net force acts on an object, no forces can be acting on it.” Which option correctly evaluates this statement?
a. correct, because all forces must disappear
b. correct, because gravity becomes zero
c. incorrect, because multiple forces can balance each other
d. incorrect, because every object must accelerate
Q10. A position–time graph is a horizontal straight line. What does it indicate about the object's motion?
a. constant non-zero velocity
b. increasing velocity
c. the object is at rest
d. constant positive acceleration
Q11. An object moves with constant velocity along a straight line. Which velocity–time graph represents its motion?
a. a horizontal line above or below zero
b. a vertical line
c. a line with continuously increasing slope
d. a curve that necessarily reaches zero
Q12. A weightlifter holds a barbell steady above the ground. Considering the upward force exerted by the weightlifter and the downward gravitational force, which statement is correct?
a. the upward force is greater
b. the downward force is greater
c. these forces are balanced
d. gravity does not act while lifting
Q13. Two forces act on an object, but the object continues moving with constant velocity. Which conclusion is correct?
a. no force acts on it
b. the net force is zero
c. its acceleration is increasing
d. its mass is zero
Q14. If the net force acting on an object of constant mass is doubled, what happens to its acceleration?
a. it becomes half
b. it remains unchanged
c. it doubles
d. it becomes four times
Q15. Two objects of masses 2 kg and 8 kg experience the same net force. What is the ratio of their accelerations, respectively?
a. 1:4
b. 4:1
c. 2:1
d. 1:2
Q16. A student doubles both the mass of an object and the net force acting on it. What happens to its acceleration?
a. it doubles
b. it halves
c. it remains unchanged
d. it becomes four times
Q17. A 100 g object is accelerated at 10 m/s². What is the net force acting on it?
a. 100 N
b. 10 N
c. 1 N
d. 0.1 N
Q18. A 25 kg stationary block is pushed forward with 55 N. Friction opposing the motion is 50 N. What is its acceleration?
a. 0.2 m/s²
b. 2.2 m/s²
c. 0.4 m/s²
d. 5 m/s²
Q19. A cart's mass remains constant while the pulling force increases from 10 N to 30 N. If its initial acceleration was 2 m/s², what is its new acceleration, assuming friction is negligible?
a. 3 m/s²
b. 4 m/s²
c. 6 m/s²
d. 8 m/s²
Q20. Why do airbags reduce the risk of serious injury during a collision?
a. they increase the passenger's mass
b. they increase stopping time and reduce force
c. they eliminate the passenger's momentum instantly without force
d. they increase the vehicle's acceleration
Q21. A car's velocity increases uniformly from 0 to 10 m/s in 5 seconds. Its mass is 1,200 kg. What is the net force?
a. 240 N
b. 600 N
c. 2,400 N
d. 12,000 N
Q22. A ball's mass remains constant while its velocity changes direction due to a net force. Which statement follows from Newton's Second Law?
a. acceleration must always point along the original velocity
b. acceleration is in the direction of the net force
c. the ball's mass must increase
d. no acceleration occurs unless speed increases
Q23. A 0.1 kg bullet is fired from a 5 kg gun. The force magnitude on each is 2 N. What are their initial acceleration magnitudes?
a. bullet: 0.4 m/s²; gun: 20 m/s²
b. bullet: 20 m/s²; gun: 0.4 m/s²
c. bullet: 2 m/s²; gun: 2 m/s²
d. bullet: 20 m/s²; gun: 20 m/s²
Q24. A fireperson struggles to hold a hose that ejects water at high speed. Which explanation is most appropriate?
a. the hose experiences no force
b. the expelled water produces a reaction force on the hose
c. gravity pushes the hose forward
d. the water's force acts only on the ground
Q25. A 4 kg box and a 6 kg box are connected by a string. A 30 N force pulls the combined system on a frictionless surface. What is the acceleration?
a. 2 m/s²
b. 3 m/s²
c. 5 m/s²
d. 7.5 m/s²
Class 9 Science Chapter 6 How Forces Affect Motion MCQs – Keep Practising!
We hope these Class 9 Science Chapter 6 How Forces Affect Motion MCQs with Answers helped you test your conceptual understanding of the chapter. These latest concept clarity MCQs are based on the new NCERT Class 9 Science Book 2026–27 Edition and are designed to strengthen your concepts and prepare you for exams.
How many questions did you answer correctly? Check your answers using the answer key above and revise the concepts where you made mistakes.
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