contact & non-contact forces

• What is the definition of a force?

  A force is a push or a 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 and direction.
• What is the unit of force?

  The unit of force is the Newton.
• How can forces be categorized?

  Forces can be divided into contact forces and non-contact forces.
• What are contact forces?

  • Forces that occur when two objects are physically touching.
  • Examples include tension, friction, air resistance, and normal contact force.
• What is an example of a contact force in a tug of war?

  The force of tension in the rope is an example of a contact force.
• How does friction act on an airplane landing on the sea?

  The force of friction acts between the water and the airplane, causing it to slow down and stop.
• What happens to a sky diver as they fall through the air?

  Air particles collide with the parachute, causing the force of air resistance to act upwards.
• What is the normal contact force?

  The normal contact force is the upward force exerted by a surface against an object resting on it.
• What is required for a normal contact force to occur?

  A normal contact force can only happen if the two objects are in direct contact.
• What are non-contact forces?

  • Forces that occur when two objects are physically separated.
  • Examples include gravitational force, electrostatic force, and magnetic force.
• What is an example of a non-contact force?

  The gravitational force that attracts the International Space Station to the Earth is an example of a non-contact force.
• What is the electrostatic force?

  The electrostatic force is the force between two charged objects.
• What happens when two objects with opposite charges interact?

  They experience an electrostatic force of attraction.
• What happens when two objects with the same type of charge interact?

  They experience an electrostatic force of repulsion.
• What is the magnetic force?

  The magnetic force is the force experienced by certain objects in a magnetic field.
• Where can students find questions on contact and non-contact forces?

  Students can find questions in the vision workbook linked in the video.