Important points about work , energy and power

Work (W) is defined as the force (F) applied to an object times the distance (d) over which the force is applied, in the direction of the force. The formula is:

W = F × d × cos(θ)

where θ is the angle between the force and the direction of motion. Work is measured in joules (J).

Energy is the capacity to do work. There are various forms of energy, including:

• Kinetic Energy (KE): The energy of an object in motion, given by the formula:

  KE = (1/2) × m × v²

  where m is mass (kg) and v is velocity (m/s).

• Potential Energy (PE): The energy stored in an object due to its position, commonly gravitational potential energy:

  PE = m × g × h

  where g is the acceleration due to gravity (approximately 9.81 m/s²) and h is height (m).

Power (P) is the rate at which work is done or energy is transferred. The formula is:

P = W/t

where t is time (s). Power is measured in watts (W), where 1 W = 1 J/s.