CP8: Forces and their affects

• What is the effect of a gravitational field on objects?

  Gravity acts between all masses pulling them towards each other, the greater an objects mass, the greater its gravitational field.
• which forces occur when objects are in contact with each other?

  Reaction, tension, friction and air resistance
• How do pairs of forces occur when objects affect each other?

  When a contact force acts between two objects, both objects experience the same size force, but in opposite directions. This is Newton's Third Law of Motion.

  
• How can you reduce unwanted energy transfer?

  lubrication
• What is are the three examples of objects interacting at a distance without contact?

  • gravitational attraction
  • Electrostatic attraction/repulsion
  • Magnetic attraction/repulsion
• what is gravitational attraction?

  • attraction between two objects with mass
  • Larger mass has a higher attraction
• what is electrostatic attraction?

  • a large charge gives a greater force
  • opposite charges repel
• what is magnetic attraction?

  • stronger magnetic gives stronger field - greater force
  • opposite poles attract
• what are two examples of contact object interaction?

  • normal contact force - force perpendicular to the surface of contact
  • friction - rough surfaces cause friction when moved
• what is the difference between vector and scalar quantities?

  Vector - both magnitude and direction

  scalar - only magnitude
• What is a contact force?

  A force that acts between two objects in direct contact with each other.
• what is a non contact force?

  Force that acts on an object without physical contact.
• what is normal contact force?

  an object at rest on a surface experiencing a reaction force perpendicular to the surface
• what is tension?


  object being stretched
• what is newtons third law of motion?

  contact force acts between two object and both objects experience the same size force in opposite direction
• what is a magnetic force?

  a force experienced by any magnetic material in a magnetic field
• what is an electrostatic force?

  a force experienced by any charged particles in an electrical field
• what is a gravitational force?

  a force experienced by any mass in a gravitational field
• how do you find a resultant force?

  add together two forces
• what happens when you resolve a force?

  where you break down a single force into two component forces at right angles to each other