A place or object, used for
comparison to determine if something is in motion
Motion is a change in position of an object with respect to
time also on its reference point. Motion is typically
described in terms of displacement, distance (scalar),
velocity, acceleration, time and speed.
International System of Units
The International System of Units is the modern
form of the metric system and is the world's
most widely used system of measurement.
Example: meter, centimeter, milimeter, decimeter
It is used to describe the distance an object moves. It is also used to describe
quantities other than length.
Speed
Equation: Distance/Time
It is the distance the object travels per unit of time.
Average speed: The average speed of an object in
an interval of time is the distance travelled by the
object divided by the duration of the interval
Calculate: Divide total distance travelled by the total time
Instantaneous Speed: instantaneous speed is the limit
of the average speed as the duration of the time
interval approaches zero.
Velocity
If both speed and direction of an object in motion is
given, then you know the velocity. It can also be said as
speed with direction
Acceleration
Acceleration refers to increasing speed,
or changing direction
Increasing speed: If the objects speed increases, it accelerates
Decreasing speed: The slowing down of an object, deceleration, is also acceleration
Changing direction: If the object travels at a constant speed, it is still accelerating. Objects can change their directions
Acceleration= Final Velocity-Initial Velocity/Time
Slope
Formula: Rise/Run
Steepness of a line on a graph is slope
Graphs
Line graph: The motion of an object can be shown in this graph where
you plot distance vs time
Speed-Versus-Time-Graph: The acceleration can be determined from the
slope/gradient of the graph. The steeper the gradient the higher the
average speed. A horizontal line indicates the object is moving at constant
velocity.
Distance-Versus-Time-Graph: The motion of an accelerating object can be
represented on it. It is usually a curve line and if the curve goes up it is
positive, whereas if it goes down it is negative