Introductory physics: Chapter 2- Newton's first law of Motion- Inertia

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11 Terms

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What are two things Galileo discovered?
1) Objects of different weight fall to the ground at the same rate in the absence of air resistance(Free fall)

2) A moving object needs no force to keep it moving in the absence of friction(Inertia)
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What is a force?
* push or pull
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What is inertia?
* property of matter to resist changes in motion
* depends on mass of object
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What was Galileo’s main discovery on his incline experiment?
* He found that if a ball comes to rest, it is due to friction
* Ball moves forever when no force acts on it
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What are the two conditions of Newton’s first law of motion state?
1) An object at rest will stay at rest unless acted on by a force

2) An object in motion will stay in motion at constant speed in a straight line unless acted on by a force
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What is a vector quantity?
* quantity that has both magnitude and direction
* represented by arrows drawn to scale→ vector
* Ex: force, velocity, acceleration
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What is “T” or tension force?
* force that’s involved with ropes
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What is the net force?
* combination of all forces that change an object’s state of motion
* combination of all forces that change an object’s state of motion
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What is the equilibrium rule?
* the vector sum of forces acting on a non-accelerating object equals zero
* the vector sum of forces acting on a non-accelerating object equals zero
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What is equilibrium?
* no change in speed with net force acting = 0
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What are the two types of equilibrium?
* static equilibrium- object at rest stays at rest
* dynamic equilibrium- object in motion stays in motion at constant speed

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