Terms in this set (56)
A force is a
push or pull
a force is needed to change ____ of an object
state of motion
True or false? Of an object is sliding on ice, it will continue sliding until a force slows it down
Define net force
combination of all forces acting on an object
Describe the forces that act on a rock at rest in your hand
support and weight act on a rock. the rock pushes down and your hand pushes up equally as much
what identifies the forces acting upward on an object suspended from a spring scale
A ___ is an arrow that represents the magnitude and direction of a quantity
what is the difference between a scalar and vector quantity?
vector quantities describe both magnitude and direction while scalar quantities only describe magnitude
Name some vector quantities
name scalar quantities
time area volume
Describe the equilibrium rule
whenever the net force on an object is 0 the object is in equilibrium
Explain the equilibrium rule matmatically and explain it
SigmaF = 0
sigma means the sum of, f means force
Describe the forces acting on a suspended object at rest
the forces acting upward and downward on the object are balanced
Identify and give the direction of the 2 forces acting on a book at rest on a table
support is up and the weight of book (gravity) is down
the ___ force is the upward force that balances the weight of an object on a surface. Give another name for this force
describe the support force of an object at rest on a horizontal surface
the support force is equal to the objects weight
if an object is moving at a ___ speed in a ____ path, it is in a state of equilibrium
True or false. If a desk is pushed at a constant speed across a horizontal floor, the force of friction must be equal i magnitude and opposite direction to the pushing force on the desk.
objects at rest are said to be in ___ equilibrium
objects moving at constant speed in a straight line path are said to be in _____ equilibrium
the sum of two or more vectors
a^2 + b^2 = c^2
Aristotle divided motion into two types:
natural and violent
natural motion on Earth was once thought to be either
straight up or straight down
Aristotle thought that it was natural for heavy things to ___ and for light things to ___
Aristotle also thought that ___ motion was natural for objects beyond Earth and that the planets and stars moved in perfect circles around _____
What force was thought to have caused a horse and a cart to experience violent motion
the pull of the horse
before the 1500s the proper state of objects was thought to be ___ unless they were being pushed or puller or were moving toward their natural resting place
true or false. Early thinkers thought that violent motion was imposed motion
true or false. it was commonly thought by ancient thinkers that if an object moved "against its nature" the some kind of force was responsible
true or false. Copernicus thought that Earth and the other planets moved around the sun.
true or false.Copernicus thought that Earth was at the center of the universe
true or false.Copernicus didn't publish his ideas until he was near death
true or false. Copernicus lived a long and happy life after his works were published
why did Copernicus do most of his work in secret?
his ideas were conservertial and he would get burned at the stake if he reveled his thoughts
what was one of Galileos great contributions to physics
demolishing the notion that a force is necessary to keep an object moving
a force is any:
push or pull
what is friction
Friction is the force that acts between materials that touch as they move past each other.
Friction is caused by irregularities in the surfaces that are touching. All irregularities
obstruct motion causing a force (friction) that opposes motion.
Based on his experiments with rolling balls, Galileo was able to conclude
that when friction is present, a ____ is needed to keep
an object moving.
the resistance of an object to change its state in motion
another name of newtons first law of motion
law of inertia
1st law of motion
an object in motion/at rest will stay """" unless acted uponn by an unbalanced force
use 1st law explain why dish stay n place when tablecloth move
dishes at rest resist change in motion and tend to remain at rest because the friction between them isn't significant enough
objects in a state of rest tend to remain at rest; only a ___ will change that state
air hocky puk slide on game table with no loss of speed. why? what stops it
no force, side of table and hitting it stops it
in force free environment how long will an object move in straight line?
does the amount of inertia depend on mass?
t or f? more mass the greater inertia
amount of space object takes up
amount of matter in an object
force of gravity on an object
why cant feel earth move
same horizantal velocity
who didnt recongnize inertia
who developed law of inertia
who believed that horizantal motion was unatural?
who was one of the first to reconize that no forrce was needed to keep an object in motion
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