________ based his theories on what he observed in nature around him, and thus came to the conclusion that motion always required a medium to resist it, like air or water.
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Galileo
________ dropped objects of different weights from the top of the Leaning Tower of Pisa and compared their falls.
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Copernicus
________ put forth the concept of a moving earth in the 16th century, but it sparked a lot of argument, as:
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Symbol
________ stands for "vector sum of, "F stands for "forces.
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dynamic equilibrium
For any object in static or ________, the sum of forces acting on it is always zero.
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Tension
________ → the stretching force causing the string to stretch.
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crate
A(n) ________ being pushed across a factory floor is in dynamic equilibrium.
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muscular effort
Forces can be gravitational, electrical, magnetic, or ________.
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Violent motion
________ is a result of pushing or pulling forces.
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uniform speed
Every object continues to remain in a state of rest or of ________ in a straight line, until it is acted upon by a nonzero net force.
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constant speed
An object moving at a(n) ________ in a straight line is another form of equilibrium.
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vertical movement
He (Aristotle) saw ________ as natural, horizontal movement as unnatural and requiring a sustaining force.
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Scalar quantity
________ → a quantity defined only by its magnitude.
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puff of smoke
A(n) ________ is made of air and will rise to the air.
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Natural motion
________ occurs due to the nature of the object and depends on the elements it contains (fire, air, water, earth)
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Vector
________ → an arrow drawn to represent a force, the length and direction of these arrows are drawn to scale.
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equilibrium
When you are in ________, your weight is equal to the force of gravity acting on you.
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downward sloping
If a ball was released from rest from the top of a(n) ________ plane, it would rise to almost the same height again on the opposite upward sloping plane.
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State of rest
________: whipping a tablecloth out from under the dishes on the tabletop, without actually disturbing the dishes.
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external force
An object in its proper place doesnt move unless subjected to a(n) ________.
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lump of clay
A feather is a mixture of earth and air and will fall to the ground when unsupported, but not as fast as the ________.
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Pounds
________ and newtons are units of weight, which are units of force.
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Vector quantity
________ → a quantity thats defined by both magnitude and direction.
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Circular motion
________ has no start or end; it keeps repeating.
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→ Inertia
________: The tendency of objects to resist changes in motion.
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Natural motion
________ is either straight up or straight down for objects on earth, and circular for celestial bodies.
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Dynamic Equilibrium
________ → when the object is moving at a constant speed in a straight line path.
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Difficulties in the concept of violent motion
forces causing the pushes and pulls werent always obvious
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[Aristotles reasoning behind the arrow continuing to move
Parting of air by the moving arrow resulted in a squeezing effect at the end of the air, causing the air to rush back and prevent a vacuum from forming
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Quick Summary
Motions of objects are due to either
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→ Inertia
The tendency of objects to resist changes in motion
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keyword
continue
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state of rest
whipping a tablecloth out from under the dishes on the tabletop, without actually disturbing the dishes
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state of motion
space probes moving constantly in outer space
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e.g
two people pulling an object in the same direction with the same amount of force each doubles the force acting on the object
Studied by 3 people
