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

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

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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Presentation Transcript
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?
• 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.