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Worksheet: Exploring Forces | Year 8 Physics (Cambridge) PDF Download

Worksheet: Exploring Forces | Year 8 Physics (Cambridge)Force

Multiple Choice Questions (MCQs)

Instruction: Select the correct option for each question.

Q1. In science, a force is defined as:
a) Only a push
b) Only a pull
c) A push or a pull
d) Energy of motion

Q2. Which of these is NOT an effect of force?
a) Change of shape
b) Change of direction
c) Production of light
d) Start/stop motion

Q3. Forces always involve:
a) Only one object
b) Interaction between two objects
c) Only moving objects
d) Only heavy objects

Q4. The SI unit of force is:
a) Joule (J)
b) Watt (W)
c) Newton (N)
d) Pascal (Pa)

Q5. Friction is a force that:
a) Aids motion
b) Always increases speed
c) Opposes motion between surfaces in contact
d) Acts only in liquids

Q6. Which is a non-contact force?
a) Muscular force
b) Friction
c) Magnetic force
d) Push with a stick

Q7. Gravity is:
a) Sometimes attractive, sometimes repulsive
b) Always repulsive
c) Always attractive
d) Only acts on Earth

Q8. Weight is measured in:
a) Kilogram (kg)
b) Newton (N)
c) Meter (m)
d) Joule (J)

Q9. An object floats in a liquid when:
a) Weight > buoyant force
b) Weight = buoyant force
c) Weight < buoyant force
d) There is no gravity

Worksheet: Exploring Forces | Year 8 Physics (Cambridge)

Fill in the Blanks

Instruction: Fill in the blanks with the correct word based on the chapter.

Q1. A force is a __________ or a __________.

Q2. If an object’s speed or direction changes, a __________ has acted.

Q3. The SI unit of force is the __________ (symbol: N).

Q4. Friction always acts in a direction __________ to motion.

Q5. Forces that act without contact are called __________ forces.

Q6. The force with which Earth pulls objects is called __________.

Q7. Weight is a __________ and is measured in newtons.

Q8. The device used to measure weight (force) in newtons is a __________ balance.

Q9. The upward force exerted by a liquid on an immersed object is called __________ force.

Q10. An object sinks when its __________ is greater than the buoyant force.
Worksheet: Exploring Forces | Year 8 Physics (Cambridge)

Short Answer Questions

Instruction: Answer the following questions in 2–3 lines.

Q1. How does friction depend on the nature of surfaces?

Q2. Explain why cycling uphill feels harder than cycling downhill.

Q3. What does “forces work in pairs” mean?

Q4. How do we find the least count of a spring balance?

Q5. Why do streamlined shapes help in air or water?

Worksheet: Exploring Forces | Year 8 Physics (Cambridge)

Match the Following

Instruction: Match Column A with the correct option in Column B.

Worksheet: Exploring Forces | Year 8 Physics (Cambridge)

Application/Reasoning (Short Problems)

Instruction: Answer the following briefly in 2–3 lines.

Q1. A wooden block is pushed on a rough table and stops after some distance. Why?

Q2. A 1 kg object has a weight of about 10 N on Earth. What will be its weight on the Moon (g ≈ 1.6 m/s²)?

Q3. A spring balance has marks 0 to 5 N with 10 equal divisions between each newton. What is its least count?

Q4. Two balloons rubbed with wool repel each other. Which force is acting and why?

Q5. A stone sinks in water but a sealed empty plastic bottle floats. Why?

Check the solutions of worksheet here.

The document Worksheet: Exploring Forces | Year 8 Physics (Cambridge) is a part of the Year 8 Course Year 8 Physics (Cambridge).
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FAQs on Worksheet: Exploring Forces - Year 8 Physics (Cambridge)

1. What are the different types of forces that are studied in Class 8 science?
Ans. In Class 8 science, students typically study various types of forces, including gravitational force, frictional force, magnetic force, and muscular force. Gravitational force is the attraction between two masses, while frictional force opposes the motion of surfaces in contact. Magnetic force acts between magnets, and muscular force is generated by the muscles in living organisms.
2. How does friction affect motion?
Ans. Friction is a force that opposes the relative motion of two surfaces in contact. It plays a crucial role in everyday activities; for example, it allows us to walk without slipping. However, friction can also slow down moving objects and cause wear on surfaces. Understanding friction helps in designing better vehicles and machinery by optimizing performance and safety.
3. Can you explain Newton's laws of motion and their significance?
Ans. Newton's laws of motion consist of three fundamental principles that describe the relationship between the motion of an object and the forces acting on it. The first law states that an object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force. The second law relates the force acting on an object to its mass and acceleration (F = ma). The third law states that for every action, there is an equal and opposite reaction. These laws are significant as they form the foundation of classical mechanics, explaining how and why objects move.
4. What is the role of gravitational force in our daily lives?
Ans. Gravitational force is the attraction between masses, and it plays a crucial role in our daily lives. It keeps us grounded on Earth, causes objects to fall when dropped, and governs the motion of celestial bodies. Gravitational force is also responsible for phenomena such as tides and the orbits of planets. Understanding this force helps us grasp concepts related to weight, mass, and the structure of our universe.
5. How can we apply the concept of forces in real-life scenarios?
Ans. The concept of forces can be applied in various real-life scenarios, such as sports, engineering, and transportation. For example, understanding friction is essential in sports to improve performance and prevent injuries. In engineering, forces are considered while constructing buildings and bridges to ensure stability and safety. In transportation, knowledge of forces helps design vehicles that are efficient and safe, such as calculating braking distances and understanding acceleration.
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