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Physics

Physics. Dr. J Seale. Objectives. The student will be able to: Describe Newton’s 1 st , 2nd and 3 rd Laws of motion.. Demonstrate ability to solve problems using Newton’s 1st , 2nd and 3 rd laws of motion. Aristotle:. Natural motion (falling, resting) and objects natural state is at rest.

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Physics

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  1. Physics Dr. J Seale

  2. Objectives • The student will be able to: • Describe Newton’s 1st, 2nd and 3rd Laws of motion.. • Demonstrate ability to solve problems using Newton’s 1st , 2nd and 3rd laws of motion.

  3. Aristotle: • Natural motion (falling, resting) and objects natural state is at rest. • Violent motion: Pushes and Pulls- An object must be pushed or pulled to get it to move.

  4. Copernicus: • Formulated theory of a moving Earth.

  5. Galileo: • Demolished the theory that force was necessary to keep an object moving. It was additional force friction that brought an object to rest. With no Friction object would keep moving.

  6. Newton’s First Law • If no net force acts on a body (Fnet = 0), then the body’s velocity cannot change; that is, the body cannot accelerate.

  7. Mass • Mass: is the measure of inertia of a body.

  8. Newton’s second law • The net force on a body is equal to the product of the body’s mass and the acceleration of the body

  9. Newton’s Third Law • When two bodies interact, the forces on the bodies from each other are always equal in magnitude and opposite in direction

  10. Kinetic Friction • If the body begins to slide along the surface, the magnitude of the frictional force rapidly decreases to a value fkgiven by the product of N and μk.

  11. Friction: • Static Friction: if the body does not move, then the static frictional force fsand the component of F that is parallel to the surface balance each other. They are equal and opposite in direction. • The magnitude of fshas a maximum value fsmax that is determined from the product of the normal force N and the coefficient of static friction μs

  12. Closure • (Fnet = 0) • F = ma • For every action there is an equal and opposite reaction

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