Contact and Non-Contact Forces Flashcards

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Questions and Answers

What is a contact force?

  • A force between two objects that are not touching.
  • A force between two objects that are touching each other. (correct)
  • A force that acts through a distance.
  • None of the above.

What is a non-contact force?

  • A force that acts through the distance between two objects. (correct)
  • A force that requires physical touch between objects.
  • A force that can only be experienced by one object.
  • None of the above.

All forces have both _________________________ and ___________________________.

magnitude, direction

What is impact force?

<p>Force acting with a direct hit</p> Signup and view all the answers

What is frictional force?

<p>Force exerted in rubbing one object against another, opposing motion.</p> Signup and view all the answers

What is buoyant force?

<p>Upward force in a fluid (gas or liquid)</p> Signup and view all the answers

What is centripetal force?

<p>Inward force of a circle or turn</p> Signup and view all the answers

What is inertia?

<p>Property of matter that tends to resist any change in velocity</p> Signup and view all the answers

What does air resistance oppose?

<p>The downward force of a feather</p> Signup and view all the answers

What are balanced forces?

<p>Forces that have a net force of zero</p> Signup and view all the answers

What are unbalanced forces?

<p>Forces that have a net force that is not zero</p> Signup and view all the answers

What is gravitational force?

<p>Force of attraction between two objects that depends on mass and distance</p> Signup and view all the answers

What is electrostatic force?

<p>Force between electrically charged objects</p> Signup and view all the answers

What is elastic force?

<p>Force capable of resuming original shape after stretching or compression</p> Signup and view all the answers

What is tension force?

<p>Forces between strings and ropes</p> Signup and view all the answers

What causes the orbits of planets and satellites?

<p>Inertia and the force of gravity</p> Signup and view all the answers

What is magnetic force?

<p>Attraction or repulsion between magnetic poles</p> Signup and view all the answers

What does the equation F=m x a represent?

<p>Newton's 2nd law of motion</p> Signup and view all the answers

Examples of contact forces include ______________________, ______________________, _________________, ___________________, ____________________, _________________ and _________________ .

<p>Buoyant force, air resistance, friction, tension, impact force, elastic force</p> Signup and view all the answers

Examples of non-contact forces include ______________________, ______________________, __________________, ___________________ .

<p>Gravitational force, electrostatic force, magnetic force, centripetal force</p> Signup and view all the answers

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Study Notes

Contact and Non-Contact Forces

  • Contact Force: Force that occurs between two objects physically touching each other.
  • Non-Contact Force: Force that acts at a distance without physical contact between objects.

Characteristics of Forces

  • Magnitude and Direction: Every force possesses both strength (magnitude) and orientation (direction).
  • Impact Force: Result of a direct collision between two objects, exerting force upon contact.

Types of Contact Forces

  • Frictional Force: Resistance encountered when two surfaces rub against each other; can be classified into rolling, sliding, fluid, or static friction.
  • Buoyant Force: Upward force exerted by a fluid, counteracting gravitational force on submerged or floating objects.
  • Tension Force: The pulling force transmitted through a string, rope, or cable.
  • Elastic Force: The ability of an object to return to its original shape after being stretched or compressed.
  • Air Resistance: Force opposing the motion of an object through air; e.g., it slows down a falling feather.
  • Impact Force: Direct force experienced during a collision.

Types of Non-Contact Forces

  • Gravitational Force: Attraction between two masses, influenced by their mass and the distance separating them.
  • Electrostatic Force: Attraction or repulsion between charged objects; like charges repel while opposite charges attract.
  • Magnetic Force: Force of attraction or repulsion between magnetic poles.
  • Centripetal Force: An inward force that keeps an object moving in a circular path.

Dynamics of Forces

  • Balanced Forces: Forces that are equal in size and opposite in direction, resulting in no change in an object's motion (net force of zero).
  • Unbalanced Forces: Forces that are not equal, producing a net force that causes acceleration, changing an object's velocity (e.g., speeding up, slowing down, or changing direction).

Key Concepts in Motion

  • Inertia: The natural tendency of an object to resist changes in its velocity, maintaining its state of motion.
  • Orbits of Planets and Satellites: Resulting from the interplay of inertia and gravitational force which keeps celestial bodies in motion around each other.

Newton's Laws

  • Newton's Second Law (F = m x a): Describes how the force acting on an object is equal to the mass of the object multiplied by its acceleration; suggests that more mass requires greater force to achieve the same acceleration.

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