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# Inertia 1

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### Transcript

• 1. What is inertia?
• By definition, inertia is the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line.
• 2. MORE
• The bigger the mass, the larger the inertia and the harder it is to initiate the movement of the object (there is a direct relationship).
• The smaller the mass, the smaller the inertia and the easier it is to initiate the movement of the object.
• The mass of an object is a quantitative measure.
• 3. Some examples of inertia:
• An elephant at rest has more inertia than a mouse that is in motion
• A 500 pound man has more inertia when he is sitting down than a small child has when she is running
• 4. The First Law of Motion (or Law of Inertia)
• An object at rest will remain at rest and an object in motion will remain in motion UNLESS acted upon by an unbalanced force.
• OR if Fnet=0, then a=0 and v=constant
• 5. Some examples of the First Law of Motion
• A cart holding a physics student is pushed at a constant speed
• A ball does not and will not move, until a girl picks it up and throws it
• 6. Net Force
• If the net force acting on the object is zero, the object will continue moving in a straight line
• Ex: If an airplane is moving at constant speed , then the net force equals to zero.