Forces in action
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9. Forces and movement

When we apply a force on a non-malleable or rigid solid, it gains acceleration.

• Acceleration is directly proportional to the net force acting on an object. (Second Newton´s Law of motion). The video explains the law and its effects.


• The equation that expresses this is: F = m × a
F = net force
m= mass of the object
a = acceleration of the object

If no force is applied to an object at rest, it will be continuing at rest.

• If no force is applied to an object in movement, it will continue moving with the same velocity, with uniform linear motion (no acceleration).

If a net force is applied to a stationary body, the body will accelerate.

• If a force acts on a body in motion, or if the sum of the forces acting on ait is not zero, it will change its motion, it will have acceleration.

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