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Kinematics Part 1: Describing motion (Definitions (Distance is total path…
Kinematics Part 1:
Describing motion
Motion is when an objects position changes with time
Translation motion (along a line)
Projectile motion (motion in a plane)
Circular motion (motion around a circle)
Motion Diagrams
Composite photo of the motion of an object, showing an objects position at several equal time intervals
Interpretation example: how fast a car is moving is indicated by the space between the images - frame indicates position of a car and time intervals between the images are the same, meaning constant velocity
Particle model for real like objects under transnational motion
Shapes and sizes play a minor in description of motion
Particle has mass but no size, no shape and no distinction between angles
Simplification of reality, describes its position and time
Measurements on position and time on theg motion diagram
Using co-ordinate system grid
Position is specified with both magnitude and direction with respect to your choice of origin of the coordinate system
Definitions
Distance is total path travelled
(Displacement = change in position) Magnitude of displacement is distance travelled in a straight line in one direction only
Instantaneous velocity is objects velocity at any instant of time (taking displacement over a very small time interval)
Acceleration is the rate of change in the velocity of an object in both magnitude and direction. For constant acceleration, the average and instantaneous acceleration are the same
Constant velocity is a state of motion of an object where there is no change in speed or direction at any instant in time during its motion
Constant accelerated motion is a state of motion of an object whose velocity changes by the same amount over successive identical time intervals during its motion
Velocity is a measure of how fast or slow and in what direction and object is moving
Indicate average velocity on a motion diagram
Has magnitude an direction (is vector), length represents magnitude, head of arrow gives direction.
Size of arrow indicates qualitatively the magnitude of the average velocity