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4.1 Forces and the Law of Inertia 4.2 Force and the Law of Acceleration - PowerPoint PPT Presentation


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Force Chapter 4 ( Ewen et al. 2005) . 4.1 Forces and the Law of Inertia 4.2 Force and the Law of Acceleration. Objectives: Related force and the law of inertia. Apply the law of acceleration. Forces. What causes an object to accelerate? Answer: forces Force is any push or pull

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4.1 Forces and the Law of Inertia 4.2 Force and the Law of Acceleration

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Force

Chapter 4 (Ewen et al. 2005)

4.1 Forces and the Law of Inertia4.2 Force and the Law of Acceleration

  • Objectives:

  • Related force and the law of inertia.

  • Apply the law of acceleration.


Forces

  • What causes an object to accelerate?

    • Answer: forces

  • Force is any push or pull

    • Forces , when unbalanced, change the motion of an object.

    • When balanced, motion stays constant.


Units for measuring force

  • Newton (N) in the SI system

  • Pounds (lb) in the English system

  • 4.45 N = 1 lb


Isaac Newton (1642-1827)

  • Newton discovered three relationships or laws between forces and motion.

    • Law of inertia: Newton’s first law

    • Law of acceleration: Newton’s second law

    • Law of action and reaction: Newton’s third law


Law of inertia

  • An object in motion continues that motion with the same velocity, and a body a rest continues at rest unless an unbalance force acts on it.


Inertia

  • The property of a body that causes it to remain at rest if at rest or to continue moving with a constant velocity.

    • It is an object’s resistance to a change in motion.

  • Inertia is directly related to mass of an object.

    • More mass, more inertia

    • Units for mass: kilogram (SI), slug (US)

    • 1kg = 0.0685 slug


Law of Acceleration: Newton’s 2nd Law

  • Relates the applied force, the mass, and the acceleration of an object.

  • It states that

    • Acceleration is directly proportional to force

    • And, inversely proportional to mass.

  • Units for force

    • 1 N = 1 kg m/s2

    • 1 lb = 1 slug ft/s2


Example 1

  • What force is necessary to produce an acceleration of 6.00 m/s2 on a mass of 5.00kg?


Example 2

  • What force is necessary to produce an acceleration of 2.00 ft/s2 on a mass of 3.00 slugs?


Example 3

  • Find the acceleration produced by a force of 500 N applied to a mass of 20.0 kg.


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