Complete speed lab

1
Class Topics
Title General Science 9/11/07
Objectives

• To assess learning about speed.

• Complete speed lab
• Acceleration Calculations
• Obstacles are those frightful things you see when
  you take your eyes off your goal.
• Henry Ford

Handouts
Saturday, October 31, 2009 848 PM
2
Class Assignments
By When
What

• Motion lab 9/11/07
• Acceleration quiz 9/12/07
• Due this class period
• Due next class period
• Due in the future

3
Graph

• Distance/time graph
• Line graph
• Graph your speed
• Graph one other persons speed
• Label

4
Review

• Velocity
• Hoops game
• Vector addition

5
Acceleration

• The rate at which velocity changes
• Changes in speed, direction, or both
• Acceleration is a vector
• Can be an increase or a decrease
• SI units
• Meters per second per second
• m/s2

6
Acceleration

• Figuring acceleration
• a (vf-vi)/t
• a acceleration
• vf final velocity
• vi initial velocity
• t time

7
Find the acceleration

• 2005 Ford GT - 18.18 mph/s
• 0-60 mph in 3.3 seconds
• 1971 Ford Pinto 3.3mph/s
• 0-60 mph in 18.0 seconds
• 2002 Chevrolet Corvette 14.6 mph/s
• 0-60 mph in 4.1 seconds
• 1980 Chevrolet Chevette 3.8 mph/s
• 0-60 mph in 15.8 seconds

8
Free fall

• Movement of an object toward Earth solely due to
  gravity
• Acceleration is 9.8 m/s2
• Figure 12

9
Workbook p.100

• Review using 10, 13-15
• Practice problems
• A car travels 107 km in 2.4 hrs. What is their
  speed?
• A runner in the 400 m dash increases his speed
  from 8.5 m/s to 9.8 m/s over 3 seconds. What is
  his acceleration?

10
Practice problems

• A car travels 107 km in 2.4 hrs. What is their
  speed?
• A runner in the 400 m dash increases his speed
  from 8.5 m/s to 9.8 m/s over 3 seconds. What is
  his acceleration?
• A baseball is thrown at the speed of 55 m/s. It
  travels for 4.9 seconds. How many meters does it
  travel?