5.2.2 Work Done & Energy Transfer

• What does "Work Done" refer to in physics?

  Work Done refers to the energy transferred when a force acts on an object, causing it to move.
• What is the formula for calculating Work Done?

  Work Done (W) = Force (F) × Distance (d) × cos(θ).
• What does the variable "F" represent in the Work Done formula?

  Force (F) is the magnitude of the force applied (in Newtons, N).
• What does the variable "d" represent in the Work Done formula?

  Distance (d) is the distance over which the force is applied (in meters, m).
• What does the variable "θ" represent in the Work Done formula?

  θ is the angle between the direction of the force and the direction of the movement.
• What is the unit of Work Done?

  The unit of work done is the Joule (J).
• How much work is done when a force of 1 Newton moves an object 1 meter in the direction of the force?

  1 Joule is the work done when a force of 1 Newton moves an object 1 meter in the direction of the force.
• What is Energy Transfer?

  • The process of converting energy from one form to another.
  • When work is done, energy is transferred to or from an object.
• What are the types of Energy Transfer?

  1. Kinetic Energy: Energy due to motion.

  2. Potential Energy: Energy stored due to position.

  3. Heat Energy: Energy converted into heat when work is done against friction.
• What happens to energy when work is done on an object?

  Energy is transferred to the object, increasing its potential or kinetic energy.
• What is positive Work Done?

  Positive Work Done occurs when work is done on an object, transferring energy to it.
• What is negative Work Done?

  Negative Work Done occurs when work is done by an object, transferring energy away from it.
• Provide an example of Work Done and Energy Transfer when lifting an object.

  • Scenario: Lifting a 10 kg box to a height of 2 meters.
  • Force (F): 98 N (10 kg × 9.8 N/kg).
  • Distance (d): 2 meters.
  • Work Done (W): 196 J (98 N × 2 m).
  • Energy transferred as gravitational potential energy.
• Provide an example of Work Done and Energy Transfer when a car accelerates.

  • Scenario: A car is pushed with a force of 500 N over a distance of 10 meters.
  • Work Done (W): 5000 J (500 N × 10 m).
  • Energy transferred to the car, increasing its kinetic energy.
• What are the different processes of Energy Transfer?

  1. Mechanical Work: Involves forces causing movement.

  2. Electrical Work: Involves electrical energy being converted into other forms.

  3. Thermal Energy: Work done against friction results in energy transferred as heat.
• What is the Law of Conservation of Energy?

  Energy cannot be created or destroyed, only transferred or converted from one form to another.
• What is the summary of Work Done and Energy Transfer?

  • Work Done: Energy transferred by a force moving an object over a distance.
  • Calculated as W = F × d × cos(θ).
  • Energy Transfer: Involves kinetic, potential, or thermal energy.
  • Units: Both measured in Joules (J).