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CBSE Class 9  >  Class 9 Test  >  Science New NCERT 2026-27 (New Syllabus)  >  Test: How Forces Affect Motion - 1 - Class 9 MCQ

How Forces Affect Motion - 1 - Free MCQ Practice Test with solutions,


MCQ Practice Test & Solutions: Test: How Forces Affect Motion - 1 (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 - 1". 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 - 1 - Question 1
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A force can change which of the following properties of an object?

Detailed Solution: Question 1

Force is defined as a push or pull acting on an object. Its effects are not limited to just one aspect. A force can: Start motion (move a stationary object) Stop motion (bring a moving object to rest) Change speed (increase or decrease velocity) Change direction (e.g., turning a moving car) Change shape (e.g., squeezing a sponge or stretching a rubber band) Hence, force can affect multiple physical properties simultaneously.

Test: How Forces Affect Motion - 1 - Question 2
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The SI unit of force is:

Detailed Solution: Question 2

The SI unit of force is newton (N), named after Isaac Newton. From Newton’s second law: Force = mass × acceleration So, 1 newton = force required to produce acceleration of 1 m/s² in a mass of 1 kg i.e., 1 N = 1 kg·m/s² Other options represent different physical quantities: Joule (energy), Watt (power), Pascal (pressure).

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Test: How Forces Affect Motion - 1 - Question 3
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Which instrument is used to measure the magnitude of a force?

Detailed Solution: Question 3

A spring balance works on Hooke’s law (extension proportional to force). When a force is applied: The spring stretches The extension is calibrated to show force directly It is commonly used to measure weight (which is also a force). Other instruments measure different quantities: thermometer (temperature), barometer (pressure), voltmeter (potential difference).

Test: How Forces Affect Motion - 1 - Question 4
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In a tug of war, both teams pull equally. Rope does not move.

Detailed Solution: Question 4

When two forces are: Equal in magnitude Opposite in direction They cancel each other → net force = 0 Such forces are called balanced forces. Since no net force acts, according to Newton’s first law, the object (rope) remains at rest.

Test: How Forces Affect Motion - 1 - Question 5
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Two forces 10 N and 6 N opposite. Net force?

Detailed Solution: Question 5

When forces act in opposite directions: Net force = difference of magnitudes = 10 N − 6 N = 4 N Direction is always towards the larger force → 10 N side. Thus, net force = 4 N in direction of 10 N.

Test: How Forces Affect Motion - 1 - Question 6
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Two forces 10 N and 6 N same direction. Net force?

Detailed Solution: Question 6

When forces act in the same direction: Net force = sum of forces = 10 N + 6 N = 16 N Since both act in same direction, resultant also acts in that direction.

Test: How Forces Affect Motion - 1 - Question 7
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Friction acts in which direction?

Detailed Solution: Question 7

Friction is a contact force that: Acts between two surfaces Opposes relative motion If an object moves forward, friction acts backward. This is why objects slow down when no external force is applied.

Test: How Forces Affect Motion - 1 - Question 8
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Least friction surface?

Detailed Solution: Question 8

Friction depends on surface roughness: Rough surfaces → more interlocking → high friction Smooth surfaces → less interlocking → low friction A polished floor has minimal irregularities → least friction.

Test: How Forces Affect Motion - 1 - Question 9
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Galileo’s contribution:

Detailed Solution: Question 9

Galileo Galilei proposed that: In absence of friction, a moving object continues indefinitely No force is required to maintain motion This idea laid the foundation for Newton’s first law and corrected earlier beliefs.

Test: How Forces Affect Motion - 1 - Question 10
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Newton’s first law:

Detailed Solution: Question 10

Newton’s first law states: An object at rest stays at rest An object in motion continues with constant velocity unless acted upon by an external force This is also called the law of inertia.

Test: How Forces Affect Motion - 1 - Question 11
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Force equals friction on moving box:

Detailed Solution: Question 11

Applied force = friction ⇒ Net force = 0 From Newton’s first law: Zero net force → no acceleration Velocity remains constant Hence, motion continues uniformly.

Test: How Forces Affect Motion - 1 - Question 12
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Position-time graph for constant velocity:

Detailed Solution: Question 12

Constant velocity means: Equal displacement in equal time Graphically: Position increases linearly with time Hence a straight line inclined to time axis Slope of line = velocity (constant).

Test: How Forces Affect Motion - 1 - Question 13
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Newton’s second law:

Detailed Solution: Question 13

Newton’s second law: F = ma ⇒ a = F / m So: Acceleration ∝ force Acceleration ∝ 1/mass Heavier objects need more force for same acceleration.

Test: How Forces Affect Motion - 1 - Question 14
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30 kg weight force:

Detailed Solution: Question 14

Weight is the force due to gravity: F = mg m = 30 kg g = 9.8 m/s² F = 30 × 9.8 = 294 N This is the force required to hold the weight steady.

Test: How Forces Affect Motion - 1 - Question 15
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Acceleration of block (5 N net, 25 kg):

Detailed Solution: Question 15

Given: Net force = 5 N Mass = 25 kg Using Newton’s second law: a = F / m = 5 / 25 = 0.2 m/s² Thus, the object accelerates slowly due to small net force.

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About this Class 9 Practice Test

This test contains 15 MCQs on How Forces Affect Motion - 1 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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