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Questions and Answers
Why do heavier objects have more friction?
Why do heavier objects have more friction?
- Heavier objects have smoother surfaces, increasing friction
- Heavier objects have higher air resistance, leading to more friction
- Heavier objects press together with greater force, causing greater friction (correct)
- Heavier objects have less surface area, resulting in more friction
In what scenario is friction desirable?
In what scenario is friction desirable?
- Walking
- Machine effectiveness
- Both a and b (correct)
- None of the above
Why does the wadded piece of paper fall to the ground immediately?
Why does the wadded piece of paper fall to the ground immediately?
- It is heavier, causing it to fall faster
- It has less surface area creating less air friction (correct)
- It has more surface area creating more air friction
- It has a smoother surface, reducing air friction
How does adding more friction help in picking up rice with a chopstick?
How does adding more friction help in picking up rice with a chopstick?
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Why is friction undesirable in most cases?
Why is friction undesirable in most cases?
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Study Notes
Friction Concepts
- Heavier objects have more friction because the normal force (force exerted by the surface) is proportional to the weight of the object, resulting in greater frictional force.
- Friction is desirable in scenarios where grip or traction is essential, such as in braking systems or in athletic competitions where athletes need to generate traction to move quickly or stop suddenly.
Gravity and Friction
- The wadded piece of paper falls to the ground immediately because the force of gravity (weight) acts on the paper, causing it to accelerate downward, and air resistance is negligible, resulting in a rapid fall.
Applications of Friction
- Adding more friction helps in picking up rice with a chopstick by increasing the grip between the chopstick and the rice, allowing for a more secure grasp.
Negative Impacts of Friction
- Friction is undesirable in most cases because it generates heat, causes wear and tear on moving parts, and decreases efficiency in systems, leading to energy losses and reduced performance.
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Description
Test your knowledge of friction with this CBSE Class 8 Science quiz. Explore the relationship between weight and friction and understand the impact of friction in different scenarios. Brush up on your understanding of friction with this engaging quiz.
