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C H A P T E R   2 Kinematics in One Dimension. Mechanics. The study of Physics begins with mechanics. Mechanics. The study of Physics begins with mechanics. Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change. .

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C h a p t e r 2 kinematics in one dimension l.jpg
C H A P T E R   2Kinematics in One Dimension


Mechanics l.jpg
Mechanics

The study of Physics begins with mechanics.


Mechanics3 l.jpg
Mechanics

The study of Physics begins with mechanics.

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change.


Mechanics4 l.jpg
Mechanics

The study of Physics begins with mechanics.

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change.

There are two parts to mechanics: Kinematics and Dynamics.


Mechanics5 l.jpg
Mechanics

The study of Physics begins with mechanics.

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change.

There are two parts to mechanics: Kinematics and Dynamics.

Kinematics deals with the concepts that are needed to describe motion, without any reference to forces. Chapter 2: Kinematics in one dimension Chapter 3: Kinematics in two dimensions


Mechanics6 l.jpg
Mechanics

The study of Physics begins with mechanics.

Mechanics is the branch of physics that focuses on the motion of objects and the forces that cause the motion to change.

There are two parts to mechanics: Kinematics and Dynamics.

Kinematics deals with the concepts that are needed to describe motion, without any reference to forces. Chapter 2: Kinematics in one dimension Chapter 3: Kinematics in two dimensions

Dynamics deals with the effect that forces have on motion. Chapter 4: Dynamics



Distance and displacement8 l.jpg
Distance and Displacement

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west.


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Distance and Displacement

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west.

Q: What is the total walked distance?


Distance and displacement10 l.jpg
Distance and Displacement

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west.

Q: What is the total walked distance? A: 130-m


Distance and displacement11 l.jpg
Distance and Displacement

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west.

Q: What is the total walked distance? A: 130-m

Q: What is the displacement?


Distance and displacement12 l.jpg
Distance and Displacement

Starting from origin, O a person walks 90-m east, then turns around and walks 40-m west.

Q: What is the total walked distance? A: 130-m

Q: What is the displacement? A: 50-m, due east.


Displacement l.jpg
Displacement

The displacement Äx is a vector that points from the initial position to the final position. SI Unit of Displacement: meter (m)


Figure 2 2 one dimensional coordinates l.jpg
Figure 2-2One-Dimensional Coordinates


2 2 speed and velocity l.jpg
2.2 Speed and Velocity

  • Average Speed

  • Average Velocity

  • Instantaneous Velocity

  • Instantaneous Speed


Average speed l.jpg
Average Speed

Units for speed: m/s, MPH, kmPH.



Average velocity l.jpg
Average Velocity

Units for velocity: m/s, MPH, kmPH.


Figure 2 6 constant velocity on an x versus t graph l.jpg
Figure 2-6Constant Velocity on an x-Versus-t Graph


Example 2 2 sprint training l.jpg
Example 2-2Sprint Training


Figure 2 4 motion along the x axis represented with an x versus t graph l.jpg
Figure 2-4Motion Along the X Axis Represented with an x-Versus-t Graph


Figure 2 5a average velocity on an x versus t graph l.jpg
Figure 2-5aAverage Velocity on an x-Versus-t Graph


Figure 2 5b average velocity on an x versus t graph l.jpg
Figure 2-5bAverage Velocity on an x-Versus-t Graph


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Instantaneous Velocity and Speed

The instantaneous velocityv indicates how fast an object moves and the direction of the motion at each instant of time.

The magnitude of the instantaneous velocity is called the instantaneous speed, and it is the number (with units) indicated by the speedometer.


Figure 2 7 instantaneous velocity l.jpg
Figure 2-7Instantaneous Velocity


Figure 2 8 graphical interpretation of average and instantaneous velocity l.jpg
Figure 2-8Graphical Interpretation of Average and Instantaneous Velocity



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Acceleration

Units: m/s2, cm/s2


Table 2 3 typical accelerations m s 2 l.jpg
Table 2-3Typical Accelerations (m/s2)


Figure 2 9 v versus t plots for motion with constant acceleration l.jpg
Figure 2-9v-Versus-t Plots for Motion with Constant Acceleration


Example 2 3 an accelerating train l.jpg
Example 2-3An Accelerating Train


Instantaneous acceleration l.jpg
Instantaneous acceleration

Acceleration at a particular instant is called instantaneous acceleration.


Figure 2 10 graphical interpretation of average and instantaneous acceleration l.jpg
Figure 2-10Graphical Interpretation of Average and Instantaneous Acceleration



Deceleration35 l.jpg
Deceleration

An object speeds up when the acceleration and velocity vectors point in the same direction.


Deceleration36 l.jpg
Deceleration

An object speeds up when the acceleration and velocity vectors point in the same direction.

Whenever the acceleration and velocity vectors have opposite directions, the object slows down and is said to be “decelerating.”


Figure 2 11 cars accelerating or decelerating l.jpg
Figure 2-11Cars Accelerating or Decelerating


Deceleration38 l.jpg
Deceleration

An object speeds up when the acceleration and velocity vectors point in the same direction.

Whenever the acceleration and velocity vectors have opposite directions, the object slows down and is said to be “decelerating.”

Example 4: A drag racer crosses the finish line, and the driver deploys a parachute and applies the brakes to slow down. The driver begins slowing down when t0 = 9.0 s and the car's velocity is v0 = +28 m/s. When t = 12.0 s, the velocity has been reduced to v = +13 m/s. What is the average acceleration of the dragster?



Figure 2 13a the average velocity l.jpg
Figure 2-13aThe Average Velocity


Figure 2 14 velocity versus time for the boat in example 2 5 l.jpg
Figure 2-14Velocity Versus Time for the Boat in Example 2-5


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