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Gyula Lorincz (30)

Lecture 4

Department

Physics and AstrophysicsCourse Code

PHYA11H3Professor

Gyula LorinczLecture

4This

**preview**shows half of the first page. to view the full**3 pages of the document.**Introduction to Physics: Lecture 4

Physics I for Life Sciences

Chapter 2: Kinematics in One Dimension

Whats is Kinematics?

● 2.1. Motion in One Dimension

○ The physics of a object are the same whether it moves along the direction

of the x-axis or the y-axis.

○ To model this, take a position graph as shown below. The initial position

of the object at time ti is si and its final position is sf at time tf.

○ To find the velocity of the

object, you must find the rise/run of the

line. Mathematically shown as :

○ By rearranging the above

equation, we arrive at one of the

fundamental equations of kinematics for

motion in one dimension:

● 2.2. Instantaneous Velocity

○ Uniform motion is a very simplified version of the motion that happens in

the real world. Rarely will you find an object moving at a constant velocity

for long periods of time.

○ As seen from previous position graphs, when velocity increases the slope

of the line also increases, causing an upwards curving graph.

○ Instantaneous velocity: defined as the velocity (speed and direction) of

an object at a instant of time.

○ Instantaneous velocity is derived using concepts from calculus. The

equation for average velocity is used to approximate velocity at an exact

moment of time as the in the equation shown

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