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Physics: Post your doubts here!

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Snowysangel

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BRAVO2six said:
Will try replying one at a time.

1) Newtons's first law of inertia states that an object will continue moving in the same direction and speed unless acted upon by an unbalanced force.. So when an object is in motion initially gradually slows down due to some unbalanced force acting on it. However, it is important to know that momentum is always conserved when there's no external or unbalanced force acting on the object. In this case, the object slows down due to an opposing external force such as friction force.
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How is friction an external force when the floor or the road or whatever is creating it?
 
princeali97

princeali97

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Snowysangel said:
How is friction an external force when the floor or the road or whatever is creating it?
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An external force is a force between a part of a system and something outside the system while external forces include the applied force, normal force, tension force, friction force, and air resistance force. When two parts of a system exert forces on each other, those forces are said to be internal forces for the system.
 
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Snowysangel

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princeali97 said:
An external force is a force between a part of a system and something outside the system while external forces include the applied force, normal force, tension force, friction force, and air resistance force. When two parts of a system exert forces on each other, those forces are said to be internal forces for the system.
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Oh so if the object is moving through air, air resistance slows it down, and since air wasnt involved in the original collision, it's not part if the system and created an external force? Ok got it thanks
 
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