lesson 2.1 Force and Motion

lesson 2.1 Force and Motion - Force and Motion An...

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Force and Motion An unbalanced force sets an object in motion An unbalanced force acting on an object in motion can change its state of motion. An unbalanced force changes the state of rest or state of motion of an object. This statement is called the first law of motion . A force is a vector quantity, it has both magnitude and direction. All the rules of vector addition are applicable to force vectors. An object remains in its state of rest or of uniform motion unless acted upon by an external net force. 1

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Inertia In the absence of an unbalanced force an object at rest will continue to be at rest and an object in uniform motion will continue to be in uniform motion. This property is called inertia . Since inertia is the tendency to resist a change in the state of rest or state of motion, it can be defined as the tendency to resist acceleration. The first law of motion is also called the law of inertia. Law of inertia helps us to define force. A force is something that changes or tends to change the state of rest or of uniform motion along a straight line of an object. 2
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The Second Law of Motion When an object at rest begins to move, it has an acceleration since the velocity changes. When an object changes its state of motion, it has an acceleration because the velocity changes. Whenever an unbalanced force acts on an object, it produces an acceleration on the object. The unbalanced force acting on a particle is proportional to the acceleration it produces on the particle. F net = m a m is a constant and is called the mass of the object. The second law of motion states that: 4
Unit of Force The second law of motion helps us to measure force using the relation: F net = m a. m is the mass of the particle and it is measured in kilogram (kg) . Acceleration is measured in ms -2 . Therefore, force is measured in kg.ms -2 Unit of force is the newton (N) The amount of force that produces an acceleration of 1 ms -2 on particle of mass 1 kg is called one newton.

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lesson 2.1 Force and Motion - Force and Motion An...

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