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Understanding Newton’s First Law of Motion

Dive into Newton's First Law of Motion, which explains how objects continue in their motion unless acted upon by an external force. Explore the concept further with Brian Drinkwine's insights.

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Understanding Newton’s First Law of Motion

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  1. Newton’s Laws

    Brian Drinkwine
  2. Newton’s First Law Newton’s first law simply states; every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. The first of Newton’s three laws is often referred to as the concept of inertia or the “Law of Inertia”. F  0, then v  constant, this is the mathematically correct way of writing what Newton’s law says, anything moving with constant velocity will continue to move at a constant velocity until an outside force acts on it. This means that there is a natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion. The underlying concept behind the first law of motion is that all forces acting on an object are equivalent to zero. The need for a seatbelt in a car is a perfect example of Newton’s first law of motion. When a car crashes, everything inside will want to keep moving forward.
  3. Newton’s Second Law Newton’s second law states; acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). When a force is produced on an object, that object will accelerate accordingly. In other words, to move a heavier object, more force must be produced on said object to make it move. Attempting to move a lighter object, less force is required to move the object. The second law of motion demonstrates an exact relationship between force, mass and acceleration. The equation is F=MA, Force = Mass x Acceleration The units of measurement used are called Newtons (N), which is simply kg m/s/s This is an example of how Newton’s second law works: Mike's car, which weighs 1,000 kg, is out of gas. Mike is trying to push the car to a gas station, and he makes the car go 0.05 m/s/s. Using Newton's Second Law, you can compute how much force Mike is applying to the car? F= 1000kg x .05m/s/s Answer: 50 Newtons
  4. Newton’s Third Law Newton’s third law states that for every action, there is an equal and opposite reaction. This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally as hard. Mathematically stated: FA= −FB, force A is responded to by force B in the opposite direction of the initial force. The two forces discussed in Newton’s third law are the same type, which brings us to the concept of the normal force or weight. Weight is the force with which a gravitational body pulls on another body. For example, when a person is standing on the ground they are exerting a force on the earth, which in turn is exerting a force back on the person. Another common example of Newton’s third law is when two people on ice skates push off of each other and they both go in the opposite direction with the same force.
  5. Daily Occurrences After studying and learning about Newton’s three laws of motion, I notice the concepts talked about more often just in daily life and the way things move in our world. Although some of the concepts may not be so obvious, they are still there and I think about them when I notice them. For example, when I am messing around with my friends and I push someone, I notice I get pushed back slightly as well.
  6. Bibliography http://csep10.phys.utk.edu/astr161/lect/history/newton3laws.html http://teachertech.rice.edu/Participants/louviere/Newton/ http://en.wikipedia.org/wiki/Newton's_laws_of_motion http://www.grc.nasa.gov/WWW/k-12/airplane/newton.html
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