contact and 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 characteristics of a force?

  All forces have both magnitude (size) 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 two categories:
  • Contact forces
  • Non-contact forces
• What is a contact force?

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

  Tension in a rope is an example of a contact force.
• In a tug of war, what type of force is acting on the soldier?

  The force of tension is pulling on the soldier.
• 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 come to a stop.
• What is air resistance in the context of a skydiver?

  Air resistance is a contact force that acts upwards as air particles collide with the parachute.
• 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.
• What happens to the normal contact force when a lamp is placed on a table?

  The table exerts an upward normal contact force equal to the downward weight of the lamp.
• What defines a non-contact force?

  A non-contact force occurs when two objects are physically separated.
• What is an example of a non-contact force?

  The gravitational force is an example of a non-contact force.
• How does gravitational force act between the Earth and the International Space Station?

  The gravitational force attracts the International Space Station to the Earth and vice versa.
• What is electrostatic force?

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

  They experience an electrostatic force of attraction.
• What occurs when two objects have the same type of charge?

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

  The magnetic force is experienced by certain objects in a magnetic field.
• What are the three examples of non-contact forces?

  • Gravitational force
  • Electrostatic force
  • Magnetic force
• Where can students find questions on contact and non-contact forces?

  In the vision workbook available through the provided link.