Acceleration is a vector quantity defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
If the velocity is changing by a constant amount every second it is called constant acceleration.
Velocity is a vector quantity defined as the rate at which the position of an object changes.
Traveling at a constant velocity means you're traveling at the same speed, in the same direction continuously. Having a constant velocity means you have zero acceleration.
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Scalar versus Vector Quantities
Scalar quantities are described by a magnitude (numerical value) alone
Vector quantities are described by both magnitude and direction
Distance versus Displacement
Distance: the measurement of how far apart objects are [scalar quantity]
Displacement: a measurement of the change in position of a moving body. A straight line connecting the start and the end points is specified in terms of length and direction. [vector quantity]
Speed versus Velocity
Speed: the rate of change of distance [scalar quantity]
Velocity: rate at which the position changes [vector quantity]
Formula for Calculating Velocity
There are 7 base SI units:
Some common mathematical prefixes to be familiar with are:
Scientific notation is a way of writing very large or very small numbers. To write in scientific notation, a number between 1-10 is multiplied by a power of 10. For example: 650 000 000 can be written as 6.5 X 10^8 and 0.0000076 can be written as 7.6 X 10^-6. The power is simply an indicator of how many places you have moved the decimal point either to the left (+) or the right (-).