# SCIE 2010U Lecture Notes - Lecture 2: Net Force, Weighing Scale, Weightlessness

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School
Department
Professor
1. Science of Pop Culture
Basic Physics (of Superheroes)
What Science Is
Natural and technological things we interact with are governed by the laws of physics.
Gives us understanding of our environment and how we can manipulate it.
Groundwork of more advanced science and technology
How can we distinguish science from non-science?
Topics
Motion
Forces
Gravity
Electricity and Magnetism
Light
Hallmarks of Science
What are position, speed and acceleration?
What are Newton’s three laws of motion?
Scientific Measurements
- Position is the point at which you are at, at one time
- Distance is the difference between 2 positions
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Mathematics – The language of Science
Speed is the distance covered per amount of travel time.
1. Speed = distance covered/travel time
Average speed is the total distance traveled divided by the time of travel.
Instantaneous speed is the speed at any instant of time.
Scientific Methods
Acceleration is the rate at which velocity changes with time.
2. Acceleration = change of velocity/time interval
how fast a distance changes (how fast velocity changes)
how quickly you’re speeding up or down
shorter/greater the time, the faster the acceleration
3. called Deaccerleration
Scientific Methods – Common Steps
The law of inertia (something has the ability to keep doing what its doing, so if you’re
sitting, you can keeping doing that or if your moving, you can keep doing that):
4. Every object continues in a state of rest or of uniform speed in a straight line unless
acted on by a nonzero force (friction = decreases speed to 0 because of its PULL
force).
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## Document Summary

Natural and technological things we interact with are governed by the laws of physics. Gives us understanding of our environment and how we can manipulate it. Position is the point at which you are at, at one time. Distance is the difference between 2 positions. Speed is the distance covered per amount of travel time: speed = distance covered/travel time. Average speed is the total distance traveled divided by the time of travel. Instantaneous speed is the speed at any instant of time. The law of acceleration: the acceleration on an object is, directly proportional to the net force on the object, inversely proportional to the mass of the object. Small net force, large mass -> small acceleration. Large net force, small mass -> large acceleration. Free fall: when the only force acting on a falling object is gravity (with negligible air resistance), the object is in a state of free fall. Force is simply a push or a pull.

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