Unit 9: Applications of Forces and Transfer of Energy

• SI Unit for Force is newton (N).
• Contact forces


  Frictional force, elastic force, tension force
• Non-contact forces


  Gravitational force, magnetic force
• To calculate weight

  Weight = Mass x Gravitational field strength

  (N) (Kg) (N/kg)
• When a force is applied on a stationary object, it can cause it to start moving.
• When a force is applied on an already moving object, it can cause it to:

  • increase in speed
  • decrease in speed
  • change its direction of movement
• Resultant force is the overall force after considering all forces acting on a body.
• A resultant force can also be known as net force.
• When forces are unbalanced, there will be a net/resultant force.