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CBSE Class 9  >  Class 9 Test  >  Science New NCERT 2026-27 (New Syllabus)  >  Test: How Forces Affect Motion - 2 - Class 9 MCQ

How Forces Affect Motion - 2 - Free MCQ Practice Test with solutions,


MCQ Practice Test & Solutions: Test: How Forces Affect Motion - 2 (15 Questions)

You can prepare effectively for Class 9 Science Class 9 New NCERT 2026-27 (New Syllabus) with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: How Forces Affect Motion - 2". These 15 questions have been designed by the experts with the latest curriculum of Class 9 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 15 minutes
  • - Number of Questions: 15

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Test: How Forces Affect Motion - 2 - Question 1
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A 25 kg block is pushed with a force of exactly 50 N, and the force of friction is also 50 N. What is the displacement of the block in 2 seconds?

Detailed Solution: Question 1

Net force = 50 − 50 = 0 N. Since the block is initially stationary and the net force is zero, it remains stationary by Newton's first law. Displacement = 0 m.

Test: How Forces Affect Motion - 2 - Question 2
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One newton is defined as the force that produces an acceleration of 1 m s⁻² on an object of mass:

Detailed Solution: Question 2

By definition, 1 N = 1 kg × 1 m s⁻². One newton is the force that gives a 1 kg object an acceleration of 1 m s⁻². This comes directly from F = ma.

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Test: How Forces Affect Motion - 2 - Question 3
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The value of acceleration due to gravity (g) near the Earth's surface is:

Detailed Solution: Question 3

The value of g = 9.8 m s⁻² near the surface of the Earth. It can be approximated as 10 m s⁻² for quick estimations. Importantly, g does not depend on the mass of the object.

Test: How Forces Affect Motion - 2 - Question 4
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A cricket player pulls their hands back while catching a ball to:

Detailed Solution: Question 4

Pulling hands back increases the time over which the ball's momentum changes. By Newton's second law, a longer stopping time means a smaller force is needed, reducing the risk of injury to the hands.

Test: How Forces Affect Motion - 2 - Question 5
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Airbags in cars reduce injury during a collision because they:

Detailed Solution: Question 5

Airbags increase the time of impact during a collision. By F = ma (rate of change of momentum), a longer impact time reduces the force experienced by passengers, significantly lowering injury risk.

Test: How Forces Affect Motion - 2 - Question 6
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Newton's third law of motion states that action and reaction forces:

Detailed Solution: Question 6

Newton's third law states that action and reaction are equal in magnitude, opposite in direction, and act on two different objects. Because they act on different objects, they do not cancel each other out.

Test: How Forces Affect Motion - 2 - Question 7
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When a rocket is launched, gases are pushed downward. The rocket moves upward. This is an application of:

Detailed Solution: Question 7

Newton's third law: the rocket pushes gases downward (action), and the gases push the rocket upward (reaction). This is the same principle used during Chandrayaan-3's Vikram Lander soft landing on the Moon.

Test: How Forces Affect Motion - 2 - Question 8
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A fruit falls toward the Earth, but the Earth does not visibly move toward the fruit. This is because:

Detailed Solution: Question 8

By Newton's third law, the fruit and Earth exert equal and opposite forces on each other. However, a = F/m. Since Earth's mass is enormous, its acceleration (a = F/M_Earth) is too small to be noticed.

Test: How Forces Affect Motion - 2 - Question 9
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A 0.1 kg bullet is fired from a 5 kg gun with a force of 2 N. What is the acceleration of the bullet?

Detailed Solution: Question 9

By Newton's third law, the force on the bullet = 2 N. Acceleration of bullet = F/m = 2/0.1 = 20 m s⁻². The gun's acceleration = 2/5 = 0.4 m s⁻². Both forces are equal but accelerations differ due to different masses.

Test: How Forces Affect Motion - 2 - Question 10
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When two boxes of masses m₁ and m₂ are connected by a string on a frictionless surface and pulled by force F, their common acceleration is:

Detailed Solution: Question 10

Treating the two boxes as a single system, the total mass = m₁ + m₂. The only external horizontal force is F. By Newton's second law: a = F / (m₁ + m₂). Internal tensions are not considered in the system approach.

Test: How Forces Affect Motion - 2 - Question 11
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Which of the following is an example of Newton's third law in daily life?

Detailed Solution: Question 11

When a swimmer pushes water backward (action), the water pushes the swimmer forward (reaction). This is a direct application of Newton's third law — equal and opposite forces acting on two different objects.

Test: How Forces Affect Motion - 2 - Question 12
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The acceleration due to gravity (g) near the Earth's surface depends on:

Detailed Solution: Question 12

The acceleration due to gravitational force by the Earth (g = 9.8 m s⁻²) does not depend on the mass, shape, or any property of the falling object. It is nearly constant near the Earth's surface.

Test: How Forces Affect Motion - 2 - Question 13
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On a velocity-time graph, an object with no net force acting on it and already moving is shown as:

Detailed Solution: Question 13

With zero net force, there is no acceleration. By Newton's first law, the object continues at constant velocity. On a velocity-time graph, constant velocity appears as a horizontal straight line at that non-zero value.

Test: How Forces Affect Motion - 2 - Question 14
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A sports car of mass 1500 kg accelerates from 0 to 10 m s⁻¹ in 5 seconds. What is the net force acting on it?

Detailed Solution: Question 14

Acceleration = (v − u)/t = (10 − 0)/5 = 2 m s⁻². Force = ma = 1500 × 2 = 3000 N in the direction of motion. This follows directly from Newton's second law F = ma.

Test: How Forces Affect Motion - 2 - Question 15
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Which of the following correctly distinguishes balanced forces from unbalanced forces?

Detailed Solution: Question 15

Balanced forces result in zero net force — the object stays at rest or continues at constant velocity (Newton's first law). Unbalanced forces produce a non-zero net force, causing acceleration in the direction of the larger force (Newton's second law).

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About this Class 9 Practice Test

This test contains 15 MCQs on How Forces Affect Motion - 2 with detailed solutions for each question. It is part of the Science Class 9 New NCERT 2026-27 (New Syllabus) course on EduRev, designed to align with the current Class 9 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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