Intro to Mechanics Descriptions of Motion MECHANICS Statics

MECHANICS Statics Kinematics Dynamics Objects at rest/equilibrium Simple descriptions of motion only Description of

When do you say that something has moved? How do you know if there

Essential: displacement vs. distance 1. Cases when total distance equals total displacement 2. Cases

�Change in its magnitude of speed �Change in its direction of movement �Change in

Kinematics on a Graphical Representations of motion

A car starts from rest from point O and speeds up at a constant

An athlete ran a distance of 100. 0 m in 9. 83 s. What

A sports car traveling at 30. 0 m/s stops suddenly in 5. 00 seconds.

Two cyclists race against the clock in a 50. 0 km cross-country route. Cyclist

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Intro to Mechanics Descriptions of Motion

MECHANICS Statics Kinematics Dynamics Objects at rest/equilibrium Simple descriptions of motion only Description of motion and its cause

When do you say that something has moved? How do you know if there is a change in position? Can an object be described as “had been moving” but has not moved at all? Note: Establish a reference point before describing motion. In problem solving, analyze carefully which is required in your solution, distance or displacement. The mistake starts from there.

Essential: displacement vs. distance 1. Cases when total distance equals total displacement 2. Cases when there is total distance covered but zero total displacement 3. Cases when total displacement is shorter than the total distance

�Change in its magnitude of speed �Change in its direction of movement �Change in both magnitude and direction Indications of a change in velocity.

Kinematics on a Graphical Representations of motion

d O t

d O t

v O t

a O t

A car starts from rest from point O and speeds up at a constant rate until it reaches 20. 0 m/s at point A. From point A, a traffic sign indicates a limit speed of 20. 0 m/s, so the driver decides to maintain his speed until point B. When the car reaches point B, there is a heavy traffic so the driver decides to slow down at a constant rate until it stops at an intersection at C. If the interval between the given points is a constant of 10. 0 seconds, determine the total distance covered by the car. Motion in a Graph

Kinematics Problem Set 1

An athlete ran a distance of 100. 0 m in 9. 83 s. What was his average speed?

A sports car traveling at 30. 0 m/s stops suddenly in 5. 00 seconds. Find its acceleration.

Two cyclists race against the clock in a 50. 0 km cross-country route. Cyclist A travels at a constant speed of 50. 0 km/h. Cyclist B started 15. 0 min after cyclist A but manages to catch up at the finish line. What is the speed of cyclist B assuming that his speed is constant? Practice Exercise 3. 4 page 55