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

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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.

- 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.

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

- 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

- 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.

- 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

- 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

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

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

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