Unit 3 Motion - Test Two Review

Flashcards based on the review notes for Unit 3 Motion, covering key vocabulary and definitions related to motion concepts, significant figures, and vector direction conventions.

Uniform Motion

Motion where the speed is constant and there is no acceleration.

Non-Uniform Motion

Also known as accelerated motion, is where the speed or velocity of an object increases or decreases.

Scalar

A quantity that has no direction, only a number and unit (e.g. distance = 100 m).

Vector

A quantity that has direction, as well as a number and unit (e.g. displacement = 1500 km [E]).

Distance

Total number of meters or kilometers covered while traveling from position 1 to position 2.

Displacement

The straight line measure from the starting point to the finish point for that section of the motion.

Acceleration

A change in the velocity of an object during a time interval; the rate of change of velocity.

Significant Figures

Digits in a number that contribute to its accuracy, including all non-zero digits, sandwich zeros, and certain trailing zeros.

Positive Direction Convention

Right, Up, [North], and [East] are assigned positive values in vector representation.

Negative Direction Convention

Left, Down, [South], and [West] are assigned negative values in vector representation.

Area under a graph

Represents displacement and can be calculated for rectangular and triangular sections.

Average Velocity

Total displacement divided by total time taken.

Acceleration Formula

a = (v2 - v1) / ∆t, where v2 is the final velocity, v1 is the initial velocity, and ∆t is the time interval.

Conversion: m/s to km/h

Multiply by 3.6.

Conversion: km/h to m/s

Divide by 3.6.

Initial Velocity

The velocity of an object at the beginning of a motion.

Final Velocity

The velocity of an object at the end of a motion.

Average Speed

Total distance traveled divided by total time taken.

Zeroes at the beginning of a number

Never significant, regardless of the position of the decimal point.

Trailing zeros with a decimal point

Considered significant.

Trailing zeros without a decimal point

Not significant.