Ch14 forceandmotionsection2
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    Ch14 forceandmotionsection2 Ch14 forceandmotionsection2 Presentation Transcript

    •  
    • Motion and Force
      • Chapter Twelve: Distance, Time, and Speed
      • Chapter Thirteen: Forces
      • Chapter Fourteen: Force and Motion
    • Chapter Fourteen: Force and Motion
      • 14.1 Newton’s First and Third Laws
      • 14.2 Newton’s Second Law
    • Investigation 14B
      • What is the relationship between force and motion?
      Newton’s Second Law
    • 14.2 Newton’s Second Law
      • Acceleration is the rate at which your velocity (speed with direction) changes.
    • 14.2 Acceleration
      • A car can change its velocity by speeding up, slowing down, or turning.
      • If an object’s acceleration is zero , the object could be moving at a constant speed in a straight line or could be stopped.
      • To calculate acceleration, you divide the change in speed by the amount of time it takes for the change to happen.
    •  
    • 14.2 Acceleration
      • If an object speeds up, it has a positive acceleration.
      • If it slows down, it has a negative acceleration.
      What is the acceleration of the sailboat?
    • 14.2 Force, mass and acceleration
      • Force causes acceleration, and mass resists acceleration.
      • Newton’s second law relates the force on an object, the mass of the object, and its acceleration.
      • Force causes acceleration, and mass resists acceleration.
    •  
      • The stronger the force on an object, the greater its acceleration.
        • Force is directly proportional to acceleration.
        • If twice the force is applied, the acceleration is twice as great.
      • The greater the mass, the smaller the acceleration for a given force.
        • Mass is inversely related to force.
        • An object with twice the mass will have half the acceleration if the same force is applied.
    • 14.2 Applying the second law
      • Keep the following important ideas in mind:
        • 1. The net force is what causes acceleration.
        • 2. If there is no acceleration, the net force must be zero.
        • 3. If there is acceleration, there must also be a net force.
        • 4. The force unit of newtons is based on kilograms, meters, and seconds
    • 14.2 Newton’s second law and gravity
      • Gravitational force exists between all objects that have mass.
      • An object is in free fall if it is accelerating due to the force of gravity and no other forces are acting on it.
      • Objects in free fall on Earth accelerate downward at 9.8 m/s2, the acceleration due to gravity .
    • 14.2 Newton’s second law and gravity
      • An object is in free fall if it is accelerating due to the force of gravity and no other forces are acting on it.
      • Objects in free fall on Earth accelerate downward at 9.8 m/s2, the acceleration due to gravity .
    •  
    • 14.2 Universal gravitation
      • Gravitational force exists between all objects that have mass.
      • You do not notice gravity between ordinary objects because it takes a huge amount of mass to create enough force to notice.
    • 14.2 Universal gravitation
      • The force of gravity between you and Earth is strong because the planet’s mass is huge.
      • Newton’s law of universal gravitation says the strength of the force depends on the mass of the objects and the distance between them.
    • 14.2 Orbital motion
      • Newton’s second law can be used to explain the motion of planets, moons, and satellites in orbit.
      • The orbiting moon falls around Earth.
      Can you kick a soccer ball into orbit? Can we launch a soccer ball into orbit?
    • Activity
      • Newton’s three laws can be used to explain the motion of everyday objects.
      • In this activity you will build a car and apply Newton’s laws to explain how it works and why it moves as it does.
      Making a Spool Car