- Work: In physics, work is defined as the measure of energy transfer that occurs when an object is subjected to a force and undergoes displacement in the direction of the force. It is the product of the magnitude of the force applied to an object and the distance over which the force is applied. Mathematically, work (W) is expressed as:
W = F * d * cosθ
where:
- W is the work done,
- F is the magnitude of the force applied,
- d is the displacement of the object in the direction of the force,
- θ is the angle between the force vector and the displacement vector.
Work is expressed in joules (J) in the International System of Units (SI).
2. Kinetic Energy: Kinetic energy is the energy possessed by an object due to its motion. It is defined as the work needed to accelerate an object of a particular mass from rest to its current velocity. Mathematically, the kinetic energy (KE) of an object is given by the equation:
-
KE = (1/2) * m * v^2
where:
- KE is the kinetic energy,
- m is the mass of the object,
- v is the velocity of the object
- Kinetic energy is a scalar quantity and is expressed in joules (J) in the SI system.