Lesson 1

• The force is a push or pull acting upon an object due to its interaction with another object.
• • Forces can cause an object to start moving, stop moving, change direction, or change shape.
  • Forces are vector quantities, meaning they have both magnitude and direction.
• Contact Forces

  • Friction - Opposes motion between two surfaces in contact.
  • Tension - Force transmitted through a string, rope, or wire when pulled tight.
  • Normal Force - Perpendicular support force exerted by a surface on an object.
• Non-Contact Forces

  • Gravitational Force - Attraction between two masses, such as Earth and an object.
  • Magnetic Force - Attraction or repulsion between magnetic poles.
  • Electrostatic Force - Attraction or repulsion between charged particles.
• A friction is the resistive force that occurs when two surfaces move across each other. Examples include rubbing hands together or a car's tires on a road.
• SOURCES OF FRICTION

  • Roughness of surface; ex. road, floor
  • Weight (forces pushing surfaces together); large objects has more friction
• TYPES OF FRICTION

  • Static Friction - friction at rest
  • Sliding Friction - something pushed across a surface.
  • Rolling Friction - between wheels & floor.
  • Fluid Friction - friction of liquids or gases.
• REDUCING FRICTION

  • Lubricants - oil, wax, grease
  • Switch from sliding to rolling
  • Smooth Surface
• Tension - A force transmitted through a string, rope, or cable when pulled tight by forces acting from opposite ends.
• Normal Force - The support force exerted upon an object in contact with another stable surface. For instance, a book resting on a table experiences a normal force from the table.
• NON-CONTACT FORCES

  Gravitational Force - A force of attraction between two masses. It keeps planets in orbit around the sun and causes objects to fall to the ground on Earth.
• Magnetic Force - A force that occurs between electrically charged particles due to their motion. It is the force that causes magnets to attract or repel each other.
• Electrostatic Force - A force between charged particles. It is responsible for the attraction or repulsion between objects with positive and negative charges.
• Force Diagrams, also called free-body diagrams, are graphical illustrations used to visualize the forces acting on an object. These diagrams represent objects as simple shapes (usually boxes or dots) with arrows indicating the direction and magnitude of each force. These can help analyze the effects of forces, predict motion, and solve problems in mechanics.