1st Quarter

• High/Low accuracy, High/Low precision?

  A) Low accuracy

  B) Low precision

  C) Low accuracy

  D) High precision

  E) High accuracy

  F) Low precision

  G) High accuracy

  H) High precision

  
• Accuracy – Compares a measurement to the true value
• Precision - describes how closely measurements are to each other and how carefully measurements were made
• Scientific Notation – Very large and very small numbers can be expressed using this ; sometimes called powers-of-10 notation
• Nx10^a ; where N is a number between 1 and 10. It can either be an integer or decimal. On the other hand, a is any positive or negative integer
• Significant figure is a reliably known digit. It help in accurately reporting values that the measurement equipment is capable of determining ; it is characterized by the fewest digits used in reporting values without losing accuracy ; the number of sf increases as the accuracy of the equipment also increases.
• Scalar Quantities – are fully described by a magnitude (numerical value) alone ; also called as Physical Quantities

  Ex. Distance, speed, volume, mass, temperature, power ,energy and time.
• Vector Quantities – are fully described by both magnitude and direction.

  Ex. Force, velocity, acceleration, displacement and momentum
• Methods of Adding Vectors:

  • Graphical Method

  ~ Polygon Method & Head-Tail Method

  • Analytical Method

  ~ Pythagorean Method

  ~ Trigonometric Method

  ~ Laws of Sine and Cosine
• Head – the terminal or final point of a vector
• Tail – the initial point of a vector
• Rene Descartes – made the cartesian plate
• Protractor – measures angle
• Ruler – measures magnitude
• Resultant – sum of 2 or more vector
• The resultant of two or more vectors that form a right angle may be computed by the Pythagorean Theorem
• Forces – is a strength use in physical action ; push or a pull to an object
• Friction Force – Rubbing of two different surfaces.
• Question: Is there force present when we comb our hair with plastic comb?

  Answer: Yes, Electrostatic Force
• Contact Force – force that requires contact on both objects to occur ; responsible for interactions applied between small and large objects.
• Normal Force – force exerted against the gravitational force present by the objects touching each other ; perpendicular to the surface of the object
• Tensional Force – force applied to a rope, string or cable that makes them to be compressed or to be stretched by pulling on each side
• Frictional Force – force created by both surfaces of the objects that is being rubbed against each other resulting by moving in either same direction or different direction ; force parallel to the surface of the object
• Air Resistance Force or Drag Force – is a force in the opposite direction of object in air or fluid ; force that opposes liquids
• Non-contact Force – Action at a Distance Forces is the other termed for noncontact forces and only results when two objects interact without any physical contact with each other
• Magnetic Force – attraction and repulsion resulted by putting together the end of same poles or different poles of the magnetic object ; impacts of action induced by the electromagnetic materials to produced magnetic fields ; magnetic fields are surrounded and produced by magnetized material and by shifting into electrical charges such as those used in electromagnets.
• Electrostatic  Force – are either attractive or repulsive resulted by positive and negative charges of particles ;  are resulted by like charges that repel like protons and unlike charges that attract like protons and electrons.
• Gravitation Force – is a pulling of objects with masses towards the center of the earth