Podcast
Questions and Answers
Define force.
Define force.
The difference between a contact force and non-contact force. Examples include a push (contact) and gravitational pull (non-contact).
What is the difference between a contact force and non-contact force?
What is the difference between a contact force and non-contact force?
A contact force is applied by bodies in physical contact, while a non-contact force acts without physical contact.
What is the SI unit for force?
What is the SI unit for force?
Newton or N
Define gravity.
Define gravity.
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Explain the Law of Universal Gravitation.
Explain the Law of Universal Gravitation.
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What two things does gravity depend on?
What two things does gravity depend on?
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What effect does distance have on gravity?
What effect does distance have on gravity?
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What is the relationship between mass and weight?
What is the relationship between mass and weight?
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What is friction?
What is friction?
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What are ways to reduce friction?
What are ways to reduce friction?
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Study Notes
Force and Friction
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Definition of Force: A contact force is applied by a body in direct contact with another, while a non-contact force acts without physical contact.
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Examples of Force Types:
- Contact Force: Friction, tension, normal force
- Non-Contact Force: Gravitational force, electromagnetic force
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SI Unit of Force: Newton (N)
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Definition of Gravity: A force that attracts objects towards one another, specifically towards the center of the Earth.
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Law of Universal Gravitation: Every particle in the universe attracts every other particle. The force is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
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Factors Affecting Gravity:
- Mass: The greater the mass, the stronger the gravitational force.
- Distance: Greater distance between objects results in weaker gravitational force.
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Effect of Distance on Gravity:
- Doubling one mass leads to a doubling of gravitational force.
- Increasing distance decreases the strength of gravitational attraction.
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Mass vs. Weight:
- Mass measures the amount of matter in an object, representing its inertia.
- Weight measures the gravitational force acting on an object, causing it to accelerate downwards.
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Definition of Friction: A resistive force caused by the interaction of rough surfaces. The rougher the surfaces, the greater the frictional force.
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Examples of Friction:
- Sliding friction when two surfaces slide past each other
- Static friction that prevents motion between surfaces at rest
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Ways to Reduce Friction:
- Use of lubricant materials (like grease or oil)
- Implementing bearing surfaces made of low-shear materials (e.g., lead/copper journal bearings).
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Description
Test your knowledge on force and friction with these flashcards. Explore the differences between contact and non-contact forces through definitions and examples. Perfect for students studying physics concepts in Chapter 2.
