FORCES

• What are scalar quantities?

  Scalar quantities have magnitude only and do not have a direction.
• Can you give examples of scalar quantities?

  Examples of scalar quantities include mass, temperature, speed, energy, distance, and time.
• What does the term 'magnitude' mean in the context of scalar quantities?

  'Magnitude' refers to the size of the quantity.
• Why does distance not provide information about direction?

  Distance is a scalar quantity, which means it has no direction associated with it.
• If you travel a distance of 800 meters, what does this tell you about your journey?

  This tells you how far you have traveled, but not the direction of your travel.
• What are some examples of vector quantities?

  Examples of vector quantities include displacement, weight, force, velocity, acceleration, and momentum.
• How does displacement differ from distance?

  Displacement is distance in a specific direction, while distance does not include direction.
• If you travel 800 meters but your displacement is 500 meters due west, what does this indicate?

  This indicates that you traveled a longer distance but ended up 500 meters in a specific direction (due west) from your starting point.
• How can vectors be represented visually?

  Vectors can be represented by arrows, where the length indicates magnitude and the direction indicates direction.
• What does the length of an arrow representing a vector signify?

  The length of the arrow represents the magnitude of the vector.
• What does the direction of an arrow representing a vector signify?

  The direction of the arrow represents the direction of the vector.
• What are the key differences between scalar and vector quantities?

  • Scalar quantities:
  • Have magnitude only
  • Examples: mass, temperature, speed, energy, distance, time
  • Vector quantities:
  • Have both magnitude and direction
  • Examples: displacement, weight, force, velocity, acceleration, momentum
• How is displacement calculated?

  • Displacement is calculated as:
  • Distance in a specific direction
  • Example: 500 meters due west
• What is the definition of a force?

  A force is a push or pull that acts on an object due to the interaction with another object.
• What are the two components that all forces have?

  All forces have both magnitude (size) and direction.
• What type of quantity is force?

  Force is a vector quantity.
• What is the unit of force?

  The unit of force is the Newton.
• What are the two categories of forces?

  • Contact forces
  • Non-contact forces
• What is a contact force?

  A contact force occurs when two objects are physically touching each other.
• What is an example of a contact force?

  Tension in a rope is an example of a contact force.
• How does tension in a rope function in a tug-of-war?


  The force of tension pulls on the soldier during the tug-of-war.
• What is another example of a contact force besides tension?

  Friction is another example of a contact force.
• How does friction affect an airplane landing on water?

  The force of friction acts between the water and the airplane, causing it to slow down and come to a stop.
• What is air resistance in the context of contact forces?

  Air resistance is a contact force that acts upwards on a skydiver as they fall through the air.
• What is the normal contact force?

  The normal contact force is the upward force exerted by a surface that supports the weight of an object resting on it.
• How does the normal contact force relate to the weight of an object?

  The normal contact force acts upward against the downward force of the object's weight when they are in contact.
• What are the characteristics of non-contact forces?

  • The two objects are physically separated.
  • They can act over a distance.
• What is an example of a non-contact force?

  Gravitational force is an example of a non-contact force.
• How does gravitational force operate between objects?


  Gravitational force attracts all objects to other objects, such as the International Space Station to the Earth.
• What is the second example of a non-contact force?

  Electrostatic force is the second example of a non-contact force.
• What happens between two charged objects in terms of electrostatic force?

  Objects with opposite charges experience an electrostatic force of attraction, while objects with the same charge experience a force of repulsion.
• What is the last example of a non-contact force mentioned?

  Magnetic force is the last example of a non-contact force mentioned.
• What does magnetic force act on?


  Magnetic force acts on certain objects in a magnetic field.
• Where can students find questions on contact and non-contact forces?

  • In the vision workbook linked in the video.
• What should you be able to describe by the end of the video on weight?

  What is meant by weight
• What is gravity?


  A force of attraction between all objects
• Why is gravity considered a non-contact force?

  Because the two objects do not need to be touching
• What type of quantity is gravity?

  Vector quantity
• What does the mass of an object tell us?

  How much matter the object has in it
• What is the unit of mass?

  Kilogram