Forces and their interactions

• What is a scalar quantity?

  A quantity that only has a magnitude

  A quantity that isn't direction dependent
• What is a vector quantity?

  A quantity that has magnitude and direction.
• How can a vector quantity be drawn and what does it show? 

  As an arrow

  The length of the arrow represents the magnitude

  The arrow points in the associated direction
• What is a force?

  A push or pull acting on an object due to an interaction with another object.
• What are the two categories that all forces can be split in to?    

  Contact

  Non-contact forces
• Give three examples of contact forces.

  Friction

  Air resistance

  Tension
• Give three examples of non-contact forces.

  Gravitational forces

  Electrostatic forces

  Magnetic forces
• Is force a vector or scalar quantity?   

  Vector

  It has both magnitude and direction
• Give three examples of vector quantities.

  Velocity

  Displacement

  Force
• Give three examples of scalar quantites? 

  Temperature

  Time

  Mass

  Speed

  Distance

  Energy 
• What is weight?

  The force that acts on an object due to gravity and the object's mass.
• What quantities does weight depend on?

  Weight = Mass × Gravitational Field Strength

  The object's mass

  The gravitational field strength at the given position in a field.   
• What is the unit used for weight?

  Newton (N)
• What is the unit used for graviational field strength? 

  N/kg
• What is meant by an object's centre of mass?

  The single point where an object's weight can be considered to act through.   
• What piece of equipment can be used to measure an object's weight?

  Newton-meter
• What is the name given to the single force that is equivalent to all the forces acting on a given object? 

  Resultant force.