Unit OneThe Newtonian Revolution

Principia: Three Laws of motionLaw of universal gravitation.

Chapter 2Describing Motion

• Speed: average and instantaneous

• Velocity

• Acceleration

• Vectors and Scalars

• Distance and Displacement

• Graphing motion

Speed Average and Instantaneous

Average Speed

Average speed equals the distance traveled divided by the time of travel.

.t

ds

Instantaneous Speed

Let’s Go to Myrtle Beach

2.2 Velocity

Vectors and Scalars

2.3 Acceleration

• Have you experienced acceleration?

• Acceleration is the rate at which velocity changes.

t

vv

t

va 0

Acceleration of a Sports Car

• http://www.cars.com/go/crp/buyingGuides/Story.jsp?section=Sports&story=sportsQuickest&subject=stories&referer=&year=2005

2.4 Graphing Motion

Position and Time DataTime (s) Position (cm)

0 0

5 4.1

10 7.9

15 12.1

20 16.0

Motion Graphs

The 100-m Dash

Uniform Acceleration

Kinematic Equations