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All About Forces

All About Forces. Forces . General Characteristics: They are vectors Push or Pull Units = Newtons, Dynes, Pounds Newton = force required to accelerate 1 kg at a rate of 1 m/s ² ** There are 4 fundamental forces**. Nature of Forces.

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All About Forces

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  1. All About Forces

  2. Forces General Characteristics: • They are vectors • Push or Pull • Units = Newtons, Dynes, Pounds • Newton = force required to accelerate 1 kg at a rate of 1 m/s² ** There are 4 fundamental forces**

  3. Nature of Forces • Forces exist in pairs (its impossible for a single force to act on an object) • Forces arise as a result of actions / reactions between objects • There are always forces acting on all objects

  4. Gravitational Force • Weakest of all forces • Only noticed when one object is massive • Acts over infinite distances

  5. Electromagnetic Force • Can be repulsive or attractive • Acts between objects with an electrical charge • This is the force involved when you push / pull an object

  6. Strong Nuclear Force • Strongest of all forces • Only acts over distances comparable to the size of an atom • The force that holds atoms together

  7. Weak Nuclear Force • Also acts over small distances • Involved in radioactive decay We will study gravitational & electromagnetic forces

  8. Newton’s 3 Laws of Motion • #1 = Objects at rest stay at rest, objects in motion stay in motion (unless acted on by an outside force).

  9. Newton’s 3 Laws of Motion • #2 = When a force acts on an object, the resulting acceleration is directly proportional to the force and inversely proportional to the mass. F = m x a

  10. Newton’s 3 Laws of Motion • #3 = For every action, there is an opposite reaction

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