science starter! review for quiz 2!. after the quiz…. a frustrated student drops a book out of a...
TRANSCRIPT
Science Starter!
Review for Quiz 2!
After the Quiz….
A frustrated student drops a book out of a window that is 18 m above the ground. A curious student below notices that it takes 1.92 s for the book to
reach the ground.
(a) Draw and label a diagram of the scenario, and identify all variables.(b) Determine the acceleration of the book, rounding to one decimal place, assuming it was dropped with zero initial velocity.
(𝒃 )𝒙=𝒙𝒐+𝒗𝒐 𝒕+𝟏𝟐𝒂𝒕𝟐
𝟎=𝟏𝟖+ (𝟎 )(𝟏 .𝟗𝟐)+𝟏𝟐𝒂 (𝟏 .𝟗𝟐)𝟐
𝟎=𝟏𝟖+𝟏.𝟖𝟒 (𝒂 )
𝒂=−𝟗 .𝟖𝒎𝒔𝟐
“Terminal Velocity”
Listen for and record the following information:
1. ‘Fall Time’
2. ‘Fall Distance’
Determine:(a) The fall distance in meters.(b) The acceleration of the rider (m/s2)
Free-Fall- Object starts at rest (vo = 0 m/s)
- In equations, “y” is used for distance (not “x”).- Object falls solely under the influence of gravity
(Resistive forces of air resistance are ignored)
Acceleration due to gravity: ag = - 9.8 m/s2
“g” = 9.8 m/s2
Galileo Galilee
• Father of Modern Science• Refuted Aristotle’s “Natural
Motion” theory• Supported Copernicus’
heliocentric model of the solar system
A brief biography...
Does ‘weight’ matter?