PHYS 1111L Lecture Notes - Lecture 5: Si Base Unit, Kinematics

70 views1 pages
27 Nov 2017
The velocity of an object is the rate of change of its position with respect to a frame of
reference, and is a function of time. Velocity is equivalent to a specification of its speed and
direction of motion (e.g. 60 km/h to the north). Velocity is an important concept in
kinematics, the branch of classical mechanics that describes the motion of bodies.
Velocity is a physical vector quantity; both magnitude and direction are needed to define it.
The scalar absolute value (magnitude) of velocity is called "speed", being a coherent derived
unit whose quantity is measured in the SI (metric system) as metres per second (m/s) or
as the SI base unit of (ms1). For example, "5 metres per second" is a scalar, whereas "5
metres per second east" is a vector. If there is a change in speed, direction or both, then
the object has a changing velocity and is said to be undergoing an acceleration.
find more resources at
find more resources at
Unlock document

This preview shows half of the first page of the document.
Unlock all 1 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.