Zusammenfassung der Ressource
MOTION
- Reference Point
- 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