5 Questions
Why do heavier objects have more friction?
Heavier objects press together with greater force, causing greater friction
In what scenario is friction desirable?
Both a and b
Why does the wadded piece of paper fall to the ground immediately?
It has less surface area creating less air friction
How does adding more friction help in picking up rice with a chopstick?
Adding more friction makes the rice stick to the chopstick
Why is friction undesirable in most cases?
Friction causes mechanical parts to seize and wear out
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.
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.
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