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Visual Worksheet: Gravity and friction | Science Olympiad Class 9 PDF Download

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FAQs on Visual Worksheet: Gravity and friction - Science Olympiad Class 9

1. What is gravity and how does it affect objects?
Ans. Gravity is a natural force that attracts two bodies towards each other, with the strength of the attraction depending on the mass of the objects and the distance between them. On Earth, gravity pulls objects toward the center of the planet, giving them weight. This force is responsible for keeping us grounded and affects the motion of everything from falling apples to planets orbiting the sun.
2. What is friction and what are its types?
Ans. Friction is the resistance that one surface or object encounters when moving over another. There are four main types of friction: static friction (the force that keeps an object at rest), kinetic friction (the force acting against a moving object), rolling friction (the resistance of a wheel rolling over a surface), and fluid friction (the resistance encountered by an object moving through a fluid). Each type plays a crucial role in everyday activities.
3. How do gravity and friction interact in everyday situations?
Ans. Gravity and friction often work together in daily life. For example, when you slide a book across a table, gravity pulls the book down onto the table, while friction between the book and the table opposes its motion. This interaction determines how easily or quickly the book moves. In sports, athletes must understand both forces to optimize their performance, such as using friction to grip the ground while running.
4. How can we calculate the force of gravity acting on an object?
Ans. The force of gravity acting on an object can be calculated using the formula: F = m × g, where F is the gravitational force, m is the mass of the object in kilograms, and g is the acceleration due to gravity (approximately 9.81 m/s² on Earth). This formula shows that heavier objects experience a greater gravitational force.
5. Why is friction important in our daily lives?
Ans. Friction is essential for many everyday activities. It allows us to walk without slipping, enables vehicles to grip the road, and helps in holding objects securely. Without friction, it would be challenging to perform tasks like writing, driving, or even standing upright. However, too much friction can lead to wear and tear, so understanding its balance is key in various applications.
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