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Force Chapter 4 (Ewen et al. 2005) Objectives: Related force and the law of inertia. Apply the law of acceleration.

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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.

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Newton (N) in the SI system Pounds (lb) in the English system 4.45 N = 1 lb

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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

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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.

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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

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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/s 2 1 lb = 1 slug ft/s 2

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What force is necessary to produce an acceleration of 6.00 m/s 2 on a mass of 5.00kg?

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What force is necessary to produce an acceleration of 2.00 ft/s 2 on a mass of 3.00 slugs?

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

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