Newton's Laws of Motion and Forces: Understanding Inertia, Net Force, and Gravity, Slides of Advanced Physics

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Physics

The plan:

• Video clip of the day
• Intro to forces
• Forces continued
• Inertia
• Newton’s Laws of Motion.
• Mass & weight

Sir Isaac Newton:

• The connection between acceleration and its cause can be summarized by three statements known as Newton's laws of motion. - the cause of acceleration is a force.
• Newton published the three laws of motion in 1687

Forces:

• What is a force?
  • a force is defined as a push or a pull.
• Some forces occur when one object touches another. Some objects are pulled by a force called gravity. Some forces, like that of gravity, cause an object to accelerate.

Natural forces:

• 1. Gravitational force: an attractive force that exists between all objects. It is the weakest force.
• 2. Electromagnetic force: these forces result from electric charge. Charged particles at rest or in motion exert electric charges on one another and particles in motion produce magnetic forces on each other. It is very large compared to the gravitational force.

3. Strong nuclear force: holds the particles in the nucleus of an atom together. It is the strongest force but only acts over the distance of a nucleus.
4. Weak force: it is a form of the electromagnetic force. And is involved in the radioactive decay of some nuclei.

Newton’s Laws of Motion:

• Newton's First Law : Inertia
  • An object with no net force acting on it remains at rest or with a constant velocity.

Newton’s Laws of Motion:

• Newton's First Law : Inertia
  • an object with no force acting on it moves with constant velocity.
  • “Things at rest stay at rest and things in motion stay in motion”

Demonstration 2

• Paul Hewitt conceptual physics quotation on this demonstration.
• “No force, we don’t know why it keeps going. But we call that ignorance Inertia. No body know why it keeps going, we just know that it does.”
• Even today people still believe that a force is required to keep an object moving.

Balanced Forces:

Textbook Transfer

Demonstration:

• Inertia is the tendency for an object not to change its motion.

Marble & Beaker

Inertia Demonstrations:

• Newspaper vs. piece of wood