The work and energy theorem states that the net work done on an object is equal to the change in its kinetic energy. In other words, the sum of all the external forces acting on an object is equal to the change in its kinetic energy.
Work is calculated by multiplying the force applied to an object by the distance it moves in the direction of the force. The formula for work is W = F * d, where W is work, F is force, and d is distance. Work is measured in joules (J).
Work and energy are closely related, as work is the transfer of energy from one object to another. The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy, showing the direct relationship between the two.
Yes, work can be negative if the force applied to an object is in the opposite direction of its displacement. This means that the object is losing energy, rather than gaining it.
The work-energy theorem is applied in various real-life situations, such as when calculating the energy used to lift an object, the force needed to stop a moving object, or the energy required to accelerate a car. It is also used in understanding the motion of objects in different types of forces, such as friction or gravity.