Work energy

• Light


  Made of photons
• Light


  • Wave
  • Particle
• Light is part of the electromagnetic spectrum
• Photons are particles of light
• Viewing the displacement transformational activities, which are responsive to the necessities of life
• Work


  Energy transferred to or by means of a force acting on an object through a displacement
• Work

  • Force by person
  • Displacement
• Work is the product of force and displacement
• Work is the energy transferred to or by means of a force acting on an object through a displacement
• The unit of work in the International System of Units (SI) is the joule (J), which represents the amount of work done when a force of one newton is applied to move an object one meter in the direction of the force
• The unit for work is joule
• The symbol theta is a variable commonly used to represent an angle
• A newton meter (N.m) is equivalent to one joule
• Newton meter represents the amount of work done when a force of one newton is applied to move an object one meter in the direction of the force
• Work is done when a force causes an object to move a certain distance in the direction of the force
• Work is done when:

  A force is applied to an object.

  The object moves in the direction of the force
• Positive Work

  When a force applied to an object and the displacement od the object in the same direction. If the anfle between the force vector and the discplacement vector is acute (less than 90 degrees)
• Positive work

  Same direction. Acute (less than 90 degrees)
• Negative work

  Opposite direction

  Obtuse (greater than 90 degrees)
• d to am

  100
• Work
• F

  Force
• d

  Displacement
• Work done is 0 as F and d are perpendicular to each other
• Displacement
• Work done is positive
• Work


  A force is applied to an object and the object moves in the direction of the force
• Types of work

  • Positive work
  • Negative work
• Positive work


  Force applied to an object and displacement are in the same direction
• Negative work

  Force and displacement are in opposite directions
• Positive work: The angle is less than 90°
• Negative work: The angle is greater than 90°
• No work: The angle is 90°
• WE = F \* D \* cos(angle)
• If WE > 0, then work is positive
• If WE < 0, then work is negative
• If WE = 0, then no work is done
• Work = 17900 N \* 25 m \* cos(angle)
• No work is done

  • Zero Displacememt
  • Force and displacement is perpendicular
  • Zero force
• Zero Displacement

  If an object doesnt move

  This means that even if force is exerted on an object.