Q:

# What is the parallelogram law in physics?

A:

In physics, the parallelogram law is a rule that states that if two vectors are adjacent to one another, then they can be added together head to tail to find the resultant by drawing a line that connects the vector with the free tail to the vector with the free head. The line that connects these vectors is the resultant vector, which also is the diagonal of a parallelogram.

## Keep Learning

If a student needs to find a resultant vector quantity R of the vectors A and B, a useful formula to use is that vector R = vector A + vector B. When drawing these three vectors, a triangle shape is formed with three angles alpha, beta and theta. Using these three angles and the sine law, the resultant is found as (R/sin theta) = (vector A /sin alpha) = (vector B/sin beta), where angles alpha, beta and theta are the angles opposite the vectors A, B and R, respectively. The resultant vector also can be found using the cosine law.

Sources:

## Related Questions

• A: The law of the pendulum, discovered by Galileo Galilei, states that swinging objects follow the same path and have a period between swings that remains con... Full Answer >
Filed Under:
• A: Hooke's law, also known as the law of elasticity, states that for small deformations of an object, the size of the deformation or the displacement is direc... Full Answer >
Filed Under:
• A: Newton's law of universal gravitation states that the force of gravity is a universal force between all objects proportional to both masses and the square ... Full Answer >
Filed Under:
• A: The law of inertia states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless... Full Answer >
Filed Under:
PEOPLE SEARCH FOR