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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 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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force chapter 4 ewen et al 2005
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
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
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
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
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
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 2 nd law
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
Example 1
  • What force is necessary to produce an acceleration of 6.00 m/s2 on a mass of 5.00kg?
example 2
Example 2
  • What force is necessary to produce an acceleration of 2.00 ft/s2 on a mass of 3.00 slugs?
example 3
Example 3
  • Find the acceleration produced by a force of 500 N applied to a mass of 20.0 kg.
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