Exploring Forces
CBSE · Class 8 · Science
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What is a force? Give the definition and SI unit.
Answer
A force is a push or pull applied on an object resulting from the object's interaction with another object. The SI unit of force is newton, written with a small 'n' and its symbol is N.
List the four main effects that a force can have on an object.
Answer
1. Make an object move from rest 2. Change the speed of a moving object 3. Change the direction of motion of an object 4. Bring about a change in the shape of an object…
Why do forces always involve at least two objects? Explain with an example.
Answer
Forces result from interaction between objects. At least two objects must interact for a force to come into play. For example, when you push a table, your hand (one object) applies force on the table …
What are contact forces? Give two examples.
Answer
Contact forces are forces that act only when there is physical contact between the objects. Examples: 1. Muscular force - when we push or pull something with our hands 2. Friction - when objects rub a…
Define muscular force and explain how it helps in bodily functions.
Answer
Muscular force is the force resulting from the action of muscles when they contract and elongate. It helps in: 1. External activities like walking, running, lifting 2. Internal functions like chewing …
What is friction? In which direction does it always act?
Answer
Friction is the force that comes into play when an object moves or tries to move over another surface. It is a contact force that always acts in a direction opposite to the direction in which the obje…
Why does friction occur between surfaces? Explain the role of surface irregularities.
Answer
Friction arises due to irregularities in the two surfaces in contact. Even smooth-looking surfaces have many minute irregularities. When surfaces are in contact, these irregularities lock into each ot…
How does the nature of surfaces affect friction? Give an example.
Answer
The force of friction depends on the nature of surfaces in contact. Friction is greater on rough surfaces compared to smooth surfaces. For example, a ball will stop sooner when rolling on a rough road…
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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