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| 2 Types of Motion by Aristotle |
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| natural motion and violent motion |
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| Straight up or down. Objects seek natural resting places. "natural" for heavy things to fall & light things to rise. Such as a boulder falling, or smoke rising |
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imposed motion. result of forces that pushed or pulled. had external cause. objects in natural resting place could not move by themselves. So, proper state of objects was 1 of rest unless pushed/pulled, or moving toward natural resting place |
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reasoned that earth and planets orbit sun -wrote De Revolutionibus |
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| demolished idea that force needed to keep object moving |
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force that acts to resist relative motion -if absent, object would need no force to continue moving |
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| the reluctance of any object to change its state of motion |
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Newton's 1st Law [law of inertia] |
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Definition
| Every object continues in a state of rest, or of motion in a straight line at constant speed, unless it is compelled to change that state by forces exerted upon it |
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| the quantity of matter in an object. More specifically, mass is a measure of the inertia, or 'laziness,' that an object exhibits in response to any effort made to start it, stop it, or otherwise change ist state of motion |
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| the force of gravity on an object |
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| The combination of all forces acting on an object. it is this that changes on object's state of motion |
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Support Force [normal force] |
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| force that completely balances the weight of an object at rest |
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a state of balance. the state of a body on which no net force acts |
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