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Newton’s laws of motion

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Fillable PowerPoint on Newton's Laws and forces introduction

Fillable PowerPoint on Newton's Laws and forces introduction

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  • 1. Newton’s Laws of Motion
    First and Third Laws
  • 2. In 1666 (at the age of 23!), had an annus mirabilis, or "miracle year,” in which he developed his three laws of motion and his Law of Universal Gravitation, conceived ideas of calculus and developed ideas on light and color.
    Terms
    Force –
    Contact Force –
    Field Force –
    A force is a and therefore has both
    and . It should be
    represented with an in drawings.
    Sir Isaac Newton (1643 – 1727)
  • 3. There are two parts to Newton’s First Law
    Newton’s First Law
  • 4. Newton’s First Law is sometimes also referred to as the .
    means .
    Examples of Newton’s First Law:
    Newton’s First Law, cont.
  • 5. Mass –
    Weight –
    The relationship between mass and weight is given by the following formula:
    Mass Versus Weight
  • 6.
    • The units (and abbreviations) for mass and weight are as follows:
    Mass Weight
    • Metric
    • 7. English (ours)
    • 8. 1 N is equal to 1 kg∙m/s2.
    • 9. The conversion factor from newtons to pounds is:
    lb = N
    • 1 kilogram is roughly equivalent to 2.2 pounds; however, we do not talk about “converting” between pounds and kilograms. Why not?
    Units for Mass and Weight
  • 10. Newton’s First Law is about one object and the forces acting on it.
    Newton’s Third Law will talk about the interaction between two objects and their forces.
    Newton’s Third Law –
    Newton’s Third Law
  • 11. You are driving down the highway and a bug splatters on your windshield. How do the forces that the bug and windshield exert on each other compare in size?
    The bug exerts more force on the car
    The car exerts more force on the bug
    The forces each exert are the same
  • 12. If you step off a ledge, you accelerate noticeably toward the earth because of the gravitational interaction between you and earth. Does the earth accelerate toward you as well?
    No; the earth is too big
    No; you do not exert a force on it
    Yes; the acceleration is too small to measure
    Yes; the earth moves as much as you do
  • 13. A horse refuses to pull a cart. The horse reasons, “According to Newton’s third law, whatever force I exert on the cart, the cart will exert an equal and opposite force on me, so the net force will be zero and I will have no chance of accelerating the cart.” What is wrong with this reasoning?
    The cart does not pull back on the horse, so there is nothing to slow the horse down
    The cart moves because of the forces acting on it, not forces it exerts on other objects
    Nothing is wrong; the horse is correct and the cart will not move.
  • 14. To determine the “net external force” acting on an object, we draw what are called free body diagrams.
    In a free body diagram, there are several things to consider.
    Forces should be drawn roughly to scale.
    You do not have to use rulers and make a scale, but if force 1 is two times as large as force 2, it should be drawn two times longer.
    Forces should be drawn as coming from the object’s center of mass
    We represent objects as boxes
    There is no environment drawn – even if it is on a table, you only draw the object
    Free Body Diagrams
  • 15. Free Body Diagrams ChecklistMnemonic :
  • 16. One student pulls a box down a hall with a rope at an angle of 30 degrees. Another student pushes the box from the other side. There is friction between the box and the floor. Draw the free body diagram.
    Free Body Diagram Example