Physics 1603 Exam Chapter 4 Review Questions and Answers 2023

According to Aristotle, natural motion was thought to be - -either straight up or straight down -According to Aristotle, violent motion was - -imposed motion - the result of forces that pushed or pulled. -example of violent motion - -objects in natural resting places could not be moved by themselves, they had to be pushed or pulled -if an object was moving "against its nature" then - -a force of some kind was responsible -if there were no force there would be - -no motion (except for in the vertical direction) -copernicus theory of moving Earth... - -believed Earth and other planets move around the Sun. -Copernicus goes with what theory - -moving earth theory -force - -any push or pull -friction - -the name given to the force that acts between materials that touch as they move past each other -friction is caused by the - -irregularities in the surfaces of objects that are touching -even smooth surfaces have - -friction -if friction were absent, - -a moving object would need NO FORCE whatever to remain in motion -Galileo argued that only when friction is present is - -a force needed to keep an object moving -Galileo found that a ball rolling on a smooth horizontal plane - -has almost constant velocity -if friction were completely absent for a ball rolling horizontally, - -the ball moving horizontally would move forever. No push or pull would be required to keep it moving once it set in motion -The smoother the planes were - -the more nearly equal would be the initial and final heights -when the second plane was longer and inclined at a smaller angle than the first angle - -the ball tended to attain the same height -the tendency of a ball to keep moving is natural and that every object - -resists change to its state of motion -mass is the measure of - -inertia -the reluctance of any body to change its state of motion is - -inertia -galileos finding about motion discredited - -artistotles theory of motion -newton's first law is also called - -law of inertia -newton's first law says - -every object continues in a state of rest, or of motion in a straight line at a constant speed, unless it is compelled to change that state by forces exerted upon it -objects at rest - -will stay at rest unless an external force is acted on it -if you slide a hockey puck along ice, it slides for a longer distance than it would on a street. this is because - -the friction force is very small