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Newton’s First Law

Newton’s First Law . Building Science Champions . In Thought. Do you believe this picture shows a balanced or unbalanced force. Explain your answer in three sentences. . Objectives. Explain how balanced and unbalanced forces are related to motion State Newton’s first law of motion

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Newton’s First Law

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  1. Newton’s First Law Building Science Champions

  2. In Thought Do you believe this picture shows a balanced or unbalanced force. Explain your answer in three sentences.

  3. Objectives Explain how balanced and unbalanced forces are related to motion State Newton’s first law of motion Define inertia

  4. Key Terms Force Net force Unbalanced force Balanced force Inertia

  5. What is Force Force is either a push or a pull When one object pushes another, the first object is exerting force on the second object Force is not only described as how strong (magnitude), but also by direction

  6. Unbalanced Forces Net force – the overall force on an object after all the forces are added together Unbalanced force – can cause an object to start or stop moving, or change direction 8N 5 N 10 N 8N

  7. Balanced Forces Balanced forces – equal forces acting on one object in opposite directions Balanced forces on an object will not change the objects acceleration, velocity or motion The sum of all forces equal 0 N 5N = 0 N 10 N 10 N 5N

  8. Balanced vs. Unbalanced Forces Balanced forces always equal 0 N and there is no change in motion Unbalanced force are always > 0 N and there is a change in motion

  9. Inertia Inertia The bus does not want to move, the force of the tourist is pushing the bus. Galileo Galilee, an Italian astronomer, first suggested that a force is needed to keep an object in motion Inertia – is the tendency of an object to resist change If an object is moving it will continue to move If an object is not moving it will continue to be still Force is needed to change an objects inertia/motion

  10. Newton’s First Law of Motion IMPORTANT AN OBJECT AT REST WILL REMAIN AT REST AND AN OBJECT MOVING AT A CONSTANT VELOCITY WILL CONTINUE TO MOVE AT A CONSTANT VELOCITY UNLESS ACTED UPON BY AN UNBALANCED FORCE.

  11. First Law Applied Newton’s first law explains why a passenger in a car continues to move when a car rapidly stops. The seatbelt is the force that holds the passenger in the car because the seatbelt is attached the car. If the passenger is not wearing a seatbelt the windshield may be the force that holds the passenger in the car, if the passenger breaks the windshield the asphalt will be the unbalanced force stopping the passenger.

  12. Mass Mass is measured in kilograms (kg). A small car may have a mass of 1,000 kg and a bicycle may have a mass of 10 kg. Which object is easier to start and stop? Mass has a direct correlation with inertia The greater the mass the greater the inertia The smaller the mass the smaller the inertia * 1 kg = 1,000 g

  13. Review Force is a push or a pull Unbalanced force creates, changes or stops acceleration Balanced forces do not change acceleration Inertia is the resistance of an object to change Coin and cup demo

  14. References Anderson, M. et all (2012) Physical Science. McGraw-Hill: Columbus Frank, D.V et al (2001). Physical Science. Prentice Hall: New Jersey

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