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# PHYA11H3 Chapter Notes -Net Force, Rotation Around A Fixed Axis

Department
Physics and Astrophysics
Course Code
PHYA11H3
Professor
Gyula Lorincz

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Motion Diagram:
Motion is the change in an objects position with time.
The path along which it moves is called an objects trajectory
Rotational motion is different because it is object’s angular position is changing.
Translation motion: The motion of the object can be approximated well enough by
keeping track of single point on the object, this works if the object is not rotation or
changing shape and is moving along a trajectory.
Particle: treat the object as if all of its mass is at a single point.
Position and Time:
To study motion we need to repeatedly measure the position of the object and the time at
which it was at each position.
Scalar: physical quantities like time, and mass- described by single quantity
Vector: Other physical quantities such as position and velocity have both magnitude and
direction (ALWAYS NEED magnitude and direction)
- Displacement: Change in position (difference between two vectors)
Change in time (vector):
Delta time= t2-t1
Velocity:
Average speed= distance travelled/time spent traveling
= delta d/ delta t
average velocity= delta x/delta t
Accelaration: velocity of the object is changing- the magnitude can change and/or the
direction can change.
Acceleration has to do with changing how fast an object is moving.
Ex: circular motion
Average acceleration: delta v (velocity)/ delta t (time)
Lecture 3:
If v and a have the same direction then they are speeding up and if in the opposite
then its slowing down
Position versus time graph: position as a function of time
Position is graphed on the vertical axis since it is a function of time.
Motion: Straight-line motion in which equals displacements occur during any sequential
equal- time intervals is called uniform motion.