CBSE Class 8 > Class 8 Notes > Science Curiosity - New NCERT > Quiz PPT: Forces
Quiz PPT: Forces
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| 1. What are the different types of forces? |  |
Ans. The different types of forces include contact forces, which require physical contact between objects, and non-contact forces, which act at a distance. Contact forces can be further divided into frictional force, tension force, normal force, and applied force. Non-contact forces include gravitational force, magnetic force, and electrostatic force.
| 2. How does frictional force affect motion? | |
Ans. The frictional force opposes the motion of an object. It acts in the opposite direction to the applied force and can either slow down or stop the motion of the object. The amount of friction depends on the surfaces in contact and the force pressing them together. Higher friction can provide better grip but can also result in more wear on surfaces.
| 3. What is the role of gravity in everyday life? | |
Ans. Gravity is the force that pulls objects towards the Earth, giving them weight. It affects various everyday activities, such as walking, dropping objects, and keeping planets in orbit around the sun. Without gravity, objects would not stay grounded, and life as we know it would be impossible.
| 4. Can you explain the concept of balanced and unbalanced forces? | |
Ans. Balanced forces occur when two or more forces acting on an object are equal in size but opposite in direction, resulting in no change in motion. Unbalanced forces, on the other hand, occur when the forces acting on an object are not equal, leading to a change in the object's state of motion, either accelerating it or causing it to move.
| 5. What is Newton's first law of motion? | |
Ans. Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will continue to move at a constant velocity unless acted upon by a net external force. This principle highlights the concept of inertia, which is the tendency of an object to resist changes in its state of motion.
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Apr 22, 2026 Last updated
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