In the realm of physics, magnitude refers to size or quantity alone. When it comes to movement, magnitude refers to the speed at which an object is traveling or its size.
Know MoreIn physics — the study of motion distance, velocity, speed and mass expressed as quantities — is divided between vectors and scalars. A one-dimensional scalar is described by its magnitude alone, while a two-dimensional vector is fully described by its magnitude and direction.
Speed is the magnitude of the movement. To describe velocity, both magnitude and direction are required. In depicting a vector in a vector diagram, or free-body diagram, the magnitude is represented by the length of the arrow.
Order of magnitude calculations are essentially an estimate. They are used in physics to approximate calculations and determine the appropriateness of values without the use of complex calculations or when precise values are unavailable. They can also be used to check the reasonableness of more precise calculations. Order of magnitude calculations are useful when comparing items that are 100 times each other or more. The amount in question is estimated to the power of ten; for example, the population of a municipality may be estimated in the tens of thousands, hundreds of thousands or millions.
Learn more about Motion & MechanicsInertia is a scalar, something that only has a magnitude, and is defined as the resistance of an object to its state of motion, which also includes the state of rest. An object's mass is a measure of its inertia. Momentum is a vector, something that has a magnitude and direction. It's a measure of an object's motion and is dependent on the product of an object's mass and velocity.
Full Answer >The magnitude of frictional force is equal to the magnitude of the normal force multiplied by a frictional coefficient. The normal force is proportional to the force of gravity and is the ground pushing back up against an object. The frictional coefficient depends on the surface properties of the objects.
Full Answer >Acceleration shows the changes in the magnitude and direction of velocity. It is a vector with a standard unit of meters per second squared.
Full Answer >Motion is defined as the action of changing position or location. Motion, along with force and energy, are concepts relevant to mechanics, a subject of physics. Within mechanics, there is a more specific field of study called kinematics, and this is the most basic level of mechanics.
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