module 5

• Physical Science Quarter 2 - Module 5: How Galileo Inferred that Objects in Vacuum Fall in Uniform Acceleration
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• This module has various parts and corresponding icons to guide the learner.
• After going through this module, the learner is expected to: 1) describe the views of motion of Aristotle and Galileo; 2) explain how Galileo inferred that object in vacuum fall with uniform acceleration; 3) compare and contrast the view of motion of Aristotle and Galileo.
• Motion is defined as the ability of an object to change its position with respect to its surroundings in given time. Motion is always observed and measured with a point of reference.
• Terms associated with motion

  • Free fall
  • Acceleration
  • Speed
• Motion is defined as the ability of an object to change its position with respect to its surroundings in given time. Motion is always observed and measured with a point of reference. All living things show motion whereas non-living things show motion only when force acts on it.
• Terms associated with motion

  • Free fall
  • Acceleration
  • Speed
• Free fall

  Motion with uniform acceleration
• Acceleration

  Change in velocity with a given time
• Speed

  Distance travelled of an object in a specific amount of time
• The pictures show a pig and a mouse were dropped from the same point in the sky, at the same time
• Aristotle's view of motion

  • Heavier objects fall faster than lighter ones
  • Force would be needed to have a constant velocity
• Galileo's view of motion

  • Object in vacuum will fall at the same time because in a vacuum there is nothing
  • Force is not necessarily required for violent motion
  • Force is not required for object moving at constant velocity
• Galileo dropped two different weights of cannon ball to the Leaning Tower of Pisa and they fell at the same time but could not measure the distance travelled
• Galileo's experimentation using inclined ramp

  1. Measured the acceleration of an object

  2. Measured that objects accelerate at the same time regardless of their size and mass
• Speed


  Distance traveled by an object divided by the time taken to travel the distance
• A ball rolling down an inclined plane increases its speed by the same value after every second
• Free fall


  Freely falling bodies undergo constant acceleration
• Gravity


  Represents the free fall acceleration, approximately 9.8 m/s2 at the surface of the earth
• Views of motion


  • Aristotle's view
  • Galileo's view