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23 Cards in this Set
- Front
- Back
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who stated that the Earth revolves around the sun?
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Copernicus
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Define friction
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force that acts to resist the relative motion (or attempted motion) of object or materials that are in contact
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Define weight
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the amount of force on an object due to gravity
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What were the 2 classes of motion that Aristotle spoke of?
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Natural motion
Violent motion |
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Describe/define the 1st motion
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violent motion imposed motion has an external case results from a push or pull
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Describe/define the 2nd motion
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natural motion proceeds from nature every object has a proper place
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Define the law of inertia
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every object continues in its state of rest or of uniform of motion or in a straight line unless it is compelled to change that state by forces impressed upon it
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Define force
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a push or pull
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How does friction act? (become apparent)
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opposite the object's motion
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What does the law of inertia apply to?
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both moving and non-moving objects
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How does mass relate to inertia?
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more mass=more inertia
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Describe Newton's 1st law, include the relationship between the Earth moving and objects on it seemingly standing still
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equilibrium is the state of no change
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What is the force that explains why a book on a table stays still?
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gravity
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If a 10 kg object is still on a table, how much force does the table exert to keep it still?
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10 N
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When does equilibrium occur?
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when all of the forces acting on an object are balanced the net force on the object is zero the sum of the upward force equals the sum of the downward force
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What is the net force of a 10 N force in the same direction of a 20 N force?
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30 N
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Study the practicing physics and check yourself diagrams on p.33
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500N = 500N
170=830N 0N= 1,000N |
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Describe/define a vector quantity
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can be represented by arrows include magnitude and direction
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Study the diagram 2.5 on p. 31
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net force-you will need to fill in the values on a diagram
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Describe the equilibrium rule, including static and dynamic equilibrium (short answer)
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Whenever the net force on an object is zero, the object is in mechanical equilibrium—this is known as the equilibrium rule. A state of no change. Dynamic equilibrium- when an object moves at a steady pace in a straight line. Static equilibrium- a state of rest.
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Describe Aristotle's beliefs discoveries. (short answer)
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-2 types of motion
-objects ha okace ve their strive to get there -motion due to sustained push or pull -Earth does not move |
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Describe Copernicus's beliefs/discoveries. (short answer)
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Earth and other planets moved around the sun
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Describe Galileo’s beliefs/ discoveries. (short answer)
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in the absence of opposing forces a moving object will continue indefinitely
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