Understanding how forces change the motion of objects becomes easier when students practice questions regularly. This Class 9 Science Chapter 6 How Forces Affect Motion Worksheet is created to help students revise important concepts like force, friction, inertia, momentum, and Newton’s laws of motion through written practice.
This worksheet is designed according to the latest CBSE Board learning approach and focuses on improving conceptual understanding, numerical-solving skills, and answer-writing practice. Students will find different types of questions, including concept-based questions, application-based problems, force calculation numericals, and exam-level exercises.
Unlike simple revision material, Worksheets help students test how well they can apply concepts in different situations. These Class 9 Worksheets are useful for school tests, homework practice, and final exam preparation. Students searching for chapter-wise Class 9 Science Worksheets can use this resource for better preparation.
This worksheet covers Class 9 Science Chapter 6 - How Forces Affect Motion and includes written practice questions with answers. It contains easy to advanced-level questions based on the CBSE syllabus to support effective learning and self-assessment.
Download Class 9 Science Chapter 6 How Forces Affect Motion Worksheet PDF
Students can download the How Forces Affect Motion Class 9 Worksheet PDF and practice questions anytime for revision. The PDF format makes it easier to solve questions offline, revise before exams, and improve written answers.
The worksheet PDF includes:
- Chapter-wise practice questions
- Concept-based exercises
- Application-based questions
- Force and momentum numericals
- CBSE exam-style questions
- Answer key for self-checking
Practicing this worksheet helps students understand how different forces affect the motion of objects and how these concepts are connected with real-life examples.
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Class 9 Science Chapter 6 How Forces Affect Motion Worksheet Questions
Practice the following Class 9 How Forces Affect Motion Worksheet questions to improve your understanding of important concepts. These questions are prepared to help students strengthen their basics and apply scientific concepts in different situations.
Concept-Based Questions
1. What is force? Explain how force can change the state of motion of an object.
2. Define balanced force and give one example from daily life.
3. What are unbalanced forces? How do they affect the movement of an object?
4. Write any three effects that force can produce on an object.
5. What is friction? Why is friction called an opposing force?
6. Explain the meaning of inertia with an example.
7. What is momentum? Write its formula and SI unit.
8. State Newton’s First Law of Motion.
9. How is force related to mass and acceleration?
10. Explain action and reaction forces with an example.
Application-Based Questions
11. Why do passengers move forward when a moving bus suddenly stops? Explain using the concept of inertia.
12. A cricket player moves his hands backward while catching a fast-moving ball. Why?
13. Why is it difficult to stop a heavy truck moving at high speed compared to a bicycle?
14. Explain why athletes run before taking a long jump.
15. Why does a rocket move upward when gases move downward?
16. A book kept on a table remains at rest. Explain the forces acting on it.
17. Why do we need more force to move a heavier object?
18. Explain why walking becomes difficult on a slippery surface.
Numerical Practice Questions
19. A force of 25 N acts on an object of mass 5 kg. Calculate its acceleration.
20. Find the force required to produce an acceleration of 4 m/s² in an object of mass 10 kg.
21. Calculate the momentum of a 6 kg object moving with a velocity of 3 m/s.
22. A body has a momentum of 40 kg m/s and mass of 8 kg. Find its velocity.
23. An object of mass 12 kg accelerates at 2 m/s². Calculate the force acting on it.
24. A force of 50 N is applied on a box, and friction acting on it is 15 N. Find the net force.
25. A moving object changes its velocity from 5 m/s to 15 m/s in 5 seconds. Calculate its acceleration.
26. Two objects have different masses but the same velocity. Which object will have greater momentum? Explain.
Exam-Level Questions
27. Explain balanced and unbalanced forces. How do they affect the motion of an object?
28. Describe Newton’s three laws of motion with suitable examples.
29. Explain the relationship between force, mass, and acceleration.
30. Why is friction necessary in our daily life? Explain with examples.
31. What happens when equal and opposite forces act on the same object? Explain.
Competency-Based Questions
32. Rohan noticed that his toy car stopped after travelling some distance on the floor. His teacher explained that a force was acting against the motion of the car.
Answer the following:
32.1. Which force caused the toy car to stop?
32.2. In which direction does this force act?
32.3. Give one situation where this force is useful.
33. A person sitting inside a moving vehicle experiences a sudden forward movement when brakes are applied.
Answer the following:
33.1. Which property of matter is responsible for this movement?
33.2. Which law of motion explains this situation?
33.3. How do seat belts help passengers?
34. During a sports activity, two students pushed objects of different masses using the same force.
Answer the following:
34.1. Which object will have more acceleration?
34.2. Which law explains the relationship between force and acceleration?
34.3. Write the formula used to calculate force.
Class 9 Science Chapter 6 How Forces Affect Motion Worksheet Answer Key
Students can use this answer key after completing the Class 9 Science Chapter 6 How Forces Affect Motion Worksheet to check their responses and understand the correct approach for solving concept-based, application-based, numerical, and competency-based questions.
Concept-Based Questions Answer Key
1. Force is a push or pull acting on an object. A force can change the speed, direction, shape, or state of rest and motion of an object.
2. Balanced forces are equal forces acting in opposite directions that do not change the state of motion of an object.
Example: A book resting on a table.
3. Unbalanced forces are forces that do not cancel each other. They change the speed, direction, or state of motion of an object.
4. Three effects of force are:
Force can change the speed of an object.
Force can change the direction of motion.
Force can change the shape of an object.
5. Friction is a force that opposes the motion of an object. It is called an opposing force because it always acts against the direction of motion.
6. Inertia is the tendency of an object to resist any change in its state of rest or motion.
Example: Passengers move forward when a moving bus suddenly stops.
7. Momentum is the quantity of motion possessed by a moving object.
Formula:
Momentum = Mass × Velocity
p = mv
SI Unit: kg m/s
8. Newton’s First Law of Motion states that an object remains at rest or continues moving with uniform motion unless an external unbalanced force acts on it.
9. According to Newton’s Second Law of Motion, force depends on mass and acceleration.
Formula:
Force = Mass × Acceleration
F = ma
10. Action and reaction forces are equal in magnitude and opposite in direction.
Example: When a person walks, the foot pushes the ground backward, and the ground pushes the person forward.
Application-Based Questions Answer Key
11. Passengers move forward when a moving bus suddenly stops because their body tries to remain in motion due to inertia. This happens because the lower body stops with the bus, but the upper body continues moving forward.
12. A cricket player moves his hands backward while catching a ball to increase the time taken to stop the ball. This reduces the impact force on the hands.
13. A heavy truck has greater mass and momentum compared to a bicycle. Due to higher momentum, more force is required to stop a moving truck.
14. Athletes run before taking a long jump to increase their speed and momentum, which helps them cover a longer distance.
15. A rocket moves upward because of Newton’s Third Law of Motion. The gases move downward, and an equal opposite reaction force pushes the rocket upward.
16. A book kept on a table remains at rest because balanced forces act on it. The gravitational force pulls it downward, while the table applies an equal upward force.
17. A heavier object has more mass and greater inertia. Therefore, more force is needed to change its state of motion.
18. Walking becomes difficult on a slippery surface because friction is reduced. Less friction makes it harder to maintain grip and move properly.
Numerical Practice Questions Answer Key
19. Given:
Force (F) = 25 N
Mass (m) = 5 kg
Formula:
F = ma
Acceleration:
a = F ÷ m
a = 25 ÷ 5
Answer: 5 m/s²
20. Given:
Mass (m) = 10 kg
Acceleration (a) = 4 m/s²
Formula:
F = ma
F = 10 × 4
Answer: 40 N
21. Given:
Mass (m) = 6 kg
Velocity (v) = 3 m/s
Formula:
p = mv
p = 6 × 3
Answer: 18 kg m/s
22. Given:
Momentum (p) = 40 kg m/s
Mass (m) = 8 kg
Formula:
Velocity = Momentum ÷ Mass
v = 40 ÷ 8
Answer: 5 m/s
23. Given:
Mass (m) = 12 kg
Acceleration (a) = 2 m/s²
Formula:
F = ma
F = 12 × 2
Answer: 24 N
24. Given:
Applied force = 50 N
Friction force = 15 N
Net force:
50 - 15
Answer: 35 N
25. Given:
Initial velocity (u) = 5 m/s
Final velocity (v) = 15 m/s
Time (t) = 5 seconds
Formula:
Acceleration = (v - u) ÷ t
a = (15 - 5) ÷ 5
Answer: 2 m/s²
26. If two objects have the same velocity, the object with greater mass will have greater momentum because:
Momentum = Mass × Velocity
A larger mass results in higher momentum.
Exam-Level Questions Answer Key
27. Balanced forces are equal and opposite forces that do not change the motion of an object. Unbalanced forces create a change in motion by changing the speed or direction of an object.
28. Newton’s Three Laws of Motion:
First Law: An object remains in its state of rest or motion unless an external force acts on it.
Second Law: The force acting on an object is equal to the product of its mass and acceleration (F = ma).
Third Law: For every action, there is an equal and opposite reaction.
29. Force, mass, and acceleration are related through Newton’s Second Law:
F = ma
Greater force produces greater acceleration, while objects with higher mass need more force to achieve the same acceleration.
30. Friction is necessary because it helps us perform daily activities like walking, writing, and driving vehicles. Without friction, objects would easily slip and controlling movement would become difficult.
31. When equal and opposite forces act on the same object, the net force becomes zero. These balanced forces do not change the object’s state of motion.
Competency-Based Questions Answer Key
32.1. The force that caused the toy car to stop is frictional force.
32.2. Friction acts in the direction opposite to the motion of the object.
32.3. Friction is useful while walking because it provides grip between our feet and the ground.
33.1. The property responsible for this movement is inertia.
33.2. This situation is explained by Newton’s First Law of Motion.
33.3. Seat belts protect passengers by preventing sudden forward movement during sudden braking and reducing the chances of injury.
34.1. The object with less mass will have more acceleration when the same force is applied.
34.2. Newton’s Second Law of Motion explains the relationship between force, mass, and acceleration.
34.3. The formula used to calculate force is:
Force = Mass × Acceleration
F = ma
Topics Covered in How Forces Affect Motion Worksheet
This worksheet helps students practice important concepts from Class 9 Science Chapter 6.
Topics covered:
- Introduction to force
- Effects of force on objects
- Balanced and unbalanced forces
- Friction and its effects
- Concept of inertia
- Newton’s First Law of Motion
- Newton’s Second Law of Motion
- Newton’s Third Law of Motion
- Momentum and its calculation
- Action and reaction forces
- Real-life applications of forces
- Force and acceleration numericals
Learning Outcomes from this Worksheet
After completing this Class 9 Science Chapter 6 Worksheet, students will be able to:
- Understand how forces affect the movement of objects
- Identify balanced and unbalanced forces
- Explain Newton’s laws using daily life examples
- Solve force and momentum-based numerical problems
- Understand the role of friction in motion
- Improve logical thinking and answer-writing skills
- Apply Science concepts in practical situations
Benefits of Solving Class 9 Science Chapter 6 How Forces Affect Motion Worksheet
Regular worksheet practice helps students improve their Science preparation.
Benefits include:
- Builds strong conceptual understanding
- Improves written answer formation
- Helps students practice CBSE question patterns
- Strengthens numerical-solving skills
- Improves speed and accuracy
- Helps in quick chapter revision
- Builds confidence before exams
Solving worksheets regularly also helps parents understand their child’s preparation level and identify topics that need more practice.
Common Mistakes Students Make in How Forces Affect Motion
Students should avoid these common mistakes while solving this chapter:
- Confusing balanced and unbalanced forces
- Writing incorrect SI units
- Forgetting formulas like F = ma and p = mv
- Mixing the concepts of mass and weight
- Not mentioning proper examples in answers
- Making calculation errors in numericals
- Thinking action and reaction forces act on the same object
Avoiding these mistakes helps students write better answers in exams.
