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CBSE Class 8 Science Friction Quiz

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Questions and Answers

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?

Walking

Machine effectiveness

Both a and b (correct)

None of the above

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?

<p>Adding more friction makes the rice stick to the chopstick</p> Signup and view all the answers

Why is friction undesirable in most cases?

<p>Friction causes mechanical parts to seize and wear out</p> Signup and view all the answers

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.