Exam 3 Flashcards
What 2 classifications did Aristotle try to understand motion?
natural and violent
What’s natural motion?
motion depends on nature of object
What’s violent motion?
pushing or pulling forces imposed motion
What did Copernicus believe about the sun and earth?
sun was in the center, not earth
Who experimented with motion?
Galileo
What did Galileo’s inclined planes do? (3)
knocked down Aristotle’s push or pull ideas
found that rest was not a natural state
introduced inertia
What is Galileo sometimes referred as?
father of experimentation
What does Newton’s 1st Law of Motion talk about? Explain it.
inertia; every object continues in its state of rest or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it
What is net force?
a force or combination of forces produces change in motion (acceleration)
What’s Newton’s concept of motion?
if you leave an object alone (natural state), it has constant velocity
What is average speed?
distance/time
What is average velocity?
displacement/time
What is the formula for acceleration?
change in velocity/time
What is the acceleration in free fall?
32 ft/s2
What does it mean when an object’s velocity is 0? (2)
the object is not moving or the object is moving but does not change direction/position
What causes acceleration?
force
True or false. Acceleration is directly proportional to the net force.
true
