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Understanding Forces and Motion: Newton's Laws Explained

This text delves into the concepts of force and motion, explaining the principles outlined in Newton's laws. A force, defined as a push or a pull, is necessary to change an object's state of motion. The first law states that an object at rest stays at rest, and an object in motion continues in motion unless acted upon by an unbalanced force. The second law establishes the relationship between mass and acceleration, stating that force equals mass times acceleration (F = ma). Finally, the role of inertia and the effect of unbalanced forces on acceleration are discussed, emphasizing that greater mass requires greater force for acceleration.

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Understanding Forces and Motion: Newton's Laws Explained

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  1. FORCE

  2. A force is a push or a pull "An object at rest tends to stay at rest and an object in motion tends to stay in motion; unless acted upon by an unbalanced force." Force: a vector with the units - Newton(N). F

  3. Unbalanced When all forces acting on an object are , the motion of the object will NOT change. balanced balanced Therefore - Unbalanced forces will cause the acceleration of an object (non-uniform motion).

  4. The more mass an object has, the more difficult it is to change the object’s state of motion - INERTIA Changing motion means an acceleration. Accelerating requires a force. F 0 m/s 10 m/s

  5. F = m a Newton's Second Law -relationship between an object’s mass and its acceleration. Force = mass x acceleration Units: N = kg m s2

  6. Acceleration of an object will always be in the same direction as the unbalanced force. force motion If the unbalanced force is in the same direction of motion, the object will speed up. If the unbalanced force is in the opposite direction of motion, the object will slow down.

  7. 20 kg Acceleration = + 5.0 m/s2 Unbalanced Force (+100 N) 20 kg Acceleration = +10.0 m/s2 Unbalanced Force (+200 N)

  8. 50 kg 50 kg 50 kg 50 kg 50 kg 50 kg Acceleration = +10.0 m/s2 Unbalanced Force (+500 N) Acceleration = -10.0 m/s2 Unbalanced Force (-500 N) + v

  9. F m = a If we apply a greater force, there will be a greater acceleration (either speeding up or slowing down). The more massive an object becomes, the greater the force necessary to reach a certain acceleration.

  10. As mass increases, so does inertia. • (resistance to changes in motion) • A unbalanced force on an object, causes acceleration of the object. • The larger the unbalanced force applied, the larger the acceleration of the object. • a larger mass requires a larger force to cause a constant acceleration.

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