Net work can be calculated using the formula $W_{net} = \Delta KE = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2$.
If more than one force acts on an object, net work is the sum of the individual works done by each force.
When net work is positive, the object's kinetic energy increases; when negative, it decreases.
Net work can also be expressed as $W_{net} = F_{net} \cdot d \cdot \cos(\theta)$ where $F_{net}$ is the net force, $d$ is displacement, and $\theta$ is the angle between them.
The Work-Energy Theorem states that net work done on an object equals its change in kinetic energy.
Review Questions
How do you calculate net work if multiple forces are acting on an object?
What happens to an object's kinetic energy if the net work done on it is negative?
Explain how the Work-Energy Theorem relates to net work.
Related terms
Kinetic Energy: The energy possessed by an object due to its motion, calculated as $KE = \frac{1}{2}mv^2$.
Work: The product of force and displacement in the direction of the force. Represented as $W = F \cdot d \cdot \cos(\theta)$.
Force: An interaction that changes or tends to change the motion of an object. Measured in newtons (N).